[ { "id": "authors:ahm4f-rk002", "collection": "authors", "collection_id": "ahm4f-rk002", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20200311-151708682", "type": "book_section", "title": "Quantitative phase gradient microscope based on multifunctional metasurfaces (Conference Presentation)", "book_title": "High Contrast Metastructures IX", "author": [ { "family_name": "Kwon", "given_name": "Hyounghan", "clpid": "Kwon-Hyounghan" }, { "family_name": "Arbabi", "given_name": "Ehsan", "orcid": "0000-0002-5328-3863", "clpid": "Arbabi-E" }, { "family_name": "Faraji-Dana", "given_name": "Mohammad Sadegh", "clpid": "Faraji-Dana-M-S" }, { "family_name": "Kamali", "given_name": "Seyedeh Mahsa", "orcid": "0000-0002-6968-811X", "clpid": "Kamali-S-M" }, { "family_name": "Faraon", "given_name": "Andrei", "orcid": "0000-0002-8141-391X", "clpid": "Faraon-A" } ], "contributor": [ { "family_name": "Chang-Hasnain", "given_name": "Connie J.", "clpid": "Chang-Hasnain-C-J" }, { "family_name": "Faraon", "given_name": "Andrei", "clpid": "Faraon-A" }, { "family_name": "Zhou", "given_name": "Weimin", "clpid": "Zhou-Weimin" } ], "abstract": "Quantitative phase imaging systems enable label-free imaging of transparent bio-samples. Miniaturization of these imaging systems will extend their potentials in biomedical and diagnostic applications. Here, we demonstrate a novel quantitative phase gradient microscope using two multifunctional metasurface layers. Thanks to the multi-functionality and compactness of the dielectric metasurfaces, the device simultaneously captures three differential interference contrast images to retrieve a quantitative phase gradient image in a single shot. Imaging experiments with diverse phase samples verify the capability to capture quantitative phase gradient data, with low noise levels and single cell resolution.", "doi": "10.1117/12.2544384", "isbn": "9781510633438", "publisher": "Society of Photo-optical Instrumentation Engineers (SPIE)", "place_of_publication": "Bellingham, WA", "publication_date": "2020-03-10", "pages": "Art. No. 112900S" }, { "id": "authors:c5an0-87j84", "collection": "authors", "collection_id": "c5an0-87j84", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190822-134054530", "type": "book_section", "title": "Double-wavelength metasurface objective lens for two-photon microscopy (Conference Presentation)", "book_title": "High Contrast Metastructures VIII", "author": [ { "family_name": "Arbabi", "given_name": "Ehsan", "orcid": "0000-0002-5328-3863", "clpid": "Arbabi-E" }, { "family_name": "Li", "given_name": "Jiaqi", "orcid": "0000-0003-2021-2310", "clpid": "Li-Jiaqi" }, { "family_name": "Hutchins", "given_name": "Romanus J.", "clpid": "Hutchins-R-J" }, { "family_name": "Kamali", "given_name": "Seyedeh Mahsa", "orcid": "0000-0002-6968-811X", "clpid": "Kamali-S-M" }, { "family_name": "Arbabi", "given_name": "Amir", "orcid": "0000-0001-8831-7552", "clpid": "Arbabi-A" }, { "family_name": "Horie", "given_name": "Yu", "orcid": "0000-0001-7083-1270", "clpid": "Horie-Yu" }, { "family_name": "Van Dorpe", "given_name": "Pol", "clpid": "Van-Dorpe-P" }, { "family_name": "Gradinaru", "given_name": "Viviana", "orcid": "0000-0001-5868-348X", "clpid": "Gradinaru-V" }, { "family_name": "Wagenaar", "given_name": "Daniel A.", "orcid": "0000-0002-6222-761X", "clpid": "Wagenaar-D-A" }, { "family_name": "Faraon", "given_name": "Andrei", "orcid": "0000-0002-8141-391X", "clpid": "Faraon-A" } ], "contributor": [ { "family_name": "Chang-Hasnain", "given_name": "Connie J.", "clpid": "Chang-Hasnain-C-J" }, { "family_name": "Faraon", "given_name": "Andrei", "clpid": "Faraon-A" }, { "family_name": "Zhou", "given_name": "Weimin", "clpid": "Zhou-Weimin" } ], "abstract": "Two-photon microscopy is a key imaging technique in biological sciences because of its superior deep tissue imaging capabilities in addition to high transverse and axial resolution. In recent years, development of low-weight miniature two-photon microscopes has been of great interest for in vivo imaging of brain activity. Limited by these mechanical constraints, most of the developed miniature two-photon microscopes utilize graded index objective lenses that usually have inferior optical characteristics compared to conventional refractive objective lenses. Dielectric metasurfaces, a recent category of diffractive optical elements with enhanced capabilities, have proven versatile in various applications ranging from lensing to holography and polarization control. Their ultrathin form factor and potentially extremely low-weight make them very attractive for applications with stringent size and weight constraints. However, despite their success in various types of microscopy and imaging applications, they have not been previously utilized for multi-photon fluorescence microscopy. The main barrier for using metasurface lenses in multi-photon microscopy arises from their large chromatic dispersion that effectively makes them single-wavelength. Here we will present a double-wavelength metasurface lens especially designed to have the same focal length at 820 and 605 nm, corresponding to the excitation and emission wavelengths of a certain fluorophore. After characterizing the poly-silicon metasurface lens at both wavelengths, we used it in a two-photon microscopy setup and demonstrated its capability to capture two-photon images qualitatively similar to images taken with a conventional objective lens. We will also discuss the effects of chromatic dispersion of the metasurface lens on its two-photon imaging performance.", "doi": "10.1117/12.2510596", "isbn": "9781510624986", "publisher": "Society of Photo-optical Instrumentation Engineers (SPIE)", "place_of_publication": "Bellingham, WA", "publication_date": "2019-03-08", "pages": "Art. No. 109280K" }, { "id": "authors:4a1tg-nag82", "collection": "authors", "collection_id": "4a1tg-nag82", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190822-134055210", "type": "book_section", "title": "Metasurface full-Stokes polarization camera (Conference Presentation)", "book_title": "High Contrast Metastructures VIII", "author": [ { "family_name": "Arbabi", "given_name": "Ehsan", "orcid": "0000-0002-5328-3863", "clpid": "Arbabi-E" }, { "family_name": "Kamali", "given_name": "Seyedeh Mahsa", "orcid": "0000-0002-6968-811X", "clpid": "Kamali-S-M" }, { "family_name": "Arbabi", "given_name": "Amir", "orcid": "0000-0001-8831-7552", "clpid": "Arbabi-A" }, { "family_name": "Faraon", "given_name": "Andrei", "orcid": "0000-0002-8141-391X", "clpid": "Faraon-A" } ], "contributor": [ { "family_name": "Chang-Hasnain", "given_name": "Connie J.", "clpid": "Chang-Hasnain-C-J" }, { "family_name": "Faraon", "given_name": "Andrei", "clpid": "Faraon-A" }, { "family_name": "Zhou", "given_name": "Weimin", "clpid": "Zhou-Weimin" } ], "abstract": "Polarization is an important degree of freedom of light carrying information that is usually missing in other degrees of freedom. Polarimetric imaging is the process of measuring the state of polarization of light over an extended scene. It has several applications ranging from remote sensing to biological and medical imaging because it provides various pieces of information about the light source or the objects with which the light has interacted. So far polarization cameras have been made using polarization filters, and therefore suffer from two major drawbacks. First, there is a theoretical 50% upper limit on the efficiency of devices based on polarization filters. Second, to fully determine the state of polarization, multiple layers should be integrated in order to make polarization filters for circular or elliptical polarization states. Here, we present a polarization camera made using dielectric metasurfaces that operates based on separating and focusing orthogonal polarization states instead of polarization filtering. This allows for overcoming both drawbacks of current polarization camera designs. At the core of the design lies the capability of dielectric metasurfaces to fully control the polarization and phase of light. This enables designing and fabricating superpixels that separate and focus orthogonal polarization states of light on adjacent pixels on an image sensor over a single metasurface layer. Using this technique we have demonstrated full-Stokes polarization cameras with experimental efficiencies surpassing 60%, and superpixel dimensions reaching 4.8 \u00b5m\u00d77.2 \u00b5m. We have also used this camera to form polarization images of custom-designed polarization targets.", "doi": "10.1117/12.2510543", "isbn": "9781510624986", "publisher": "Society of Photo-optical Instrumentation Engineers (SPIE)", "place_of_publication": "Bellingham, WA", "publication_date": "2019-03-08", "pages": "Art. No. 109280H" }, { "id": "authors:50pg5-ytf57", "collection": "authors", "collection_id": "50pg5-ytf57", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190822-134052234", "type": "book_section", "title": "Interfacing single-photon emitters in atomically thin van der Waals crystals with photonic metasurfaces (Conference Presentation)", "book_title": "High Contrast Metastructures VIII", "author": [ { "family_name": "Jha", "given_name": "Pankaj K.", "clpid": "Jha-P-K" }, { "family_name": "Shirmanesh", "given_name": "Ghazaleh K.", "clpid": "Shirmanesh-G-K" }, { "family_name": "Mitskovets", "given_name": "Anna", "clpid": "Miskovets-A" }, { "family_name": "Nagpal", "given_name": "Arun", "clpid": "Nagpal-Arun" }, { "family_name": "Akbari", "given_name": "Hamidreza", "clpid": "Akbari-Hamidreza" }, { "family_name": "Vest", "given_name": "Benjamin", "clpid": "Vest-B" }, { "family_name": "Went", "given_name": "Cora", "clpid": "Went-C-M" }, { "family_name": "Sokhoyan", "given_name": "Ruzan", "orcid": "0000-0003-4599-6350", "clpid": "Sokhoyan-R" }, { "family_name": "Atwater", "given_name": "Harry A.", "orcid": "0000-0001-9435-0201", "clpid": "Atwater-H-A" } ], "contributor": [ { "family_name": "Chang-Hasnain", "given_name": "Connie J.", "clpid": "Chang-Hasnain-C-J" }, { "family_name": "Faraon", "given_name": "Andrei", "clpid": "Faraon-A" }, { "family_name": "Zhou", "given_name": "weimin", "clpid": "Zhou-Weimin" } ], "abstract": "One of the central challenges for practical applications of single-photon sources is the ability to efficiently extract light from a single quantum emitter. A useful single-photon source must emit into a well-defined direction because in practice one can collect light only in a finite solid angle. Here, we propose to harness the exceptional light molding capabilities of photonic metasurfaces to engineer the emission from quantum emitters and achieve highly directional emission. We have designed a phase gradient reflectarray metasurface, which efficiently collects spontaneous emission from a quantum emitter, located in the far-field (d~5 wavelengths), and redirects it back to the source. By controlling the phase imprinted by the metasurface on the incident light, we control the emission properties of the emitters. We apply this concept to design a metasurface for use with hexagonal boron nitride (hBN) single photon emitters operating at 620 nm. We have observed experimentally bright single photon emission at 620 nm with a remarkably narrow spectral width of zero-phonon line emission from multilayer hBN films synthesized by chemical vapor deposition. Simulations show that at a wavelength of 620 nm, the reflection efficiency of our metasurface is greater than 85%, and that the emission from these emitters are highly directional with deviation from emission in the surface-normal direction of 2\u2206\u03b8 ~ 20\u00b0. We will report on experimental measurements of hBN quantum emitters coupled to metasurfaces and describe metasurface designs for coupling of multiple quantum emitters.", "doi": "10.1117/12.2510989", "isbn": "9781510624986", "publisher": "Society of Photo-optical Instrumentation Engineers (SPIE)", "place_of_publication": "Bellingham, WA", "publication_date": "2019-03-08", "pages": "Art. No. 1092814" }, { "id": "authors:7f8r0-nq125", "collection": "authors", "collection_id": "7f8r0-nq125", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190822-134052333", "type": "book_section", "title": "Multifunctional active reflectarray metasurfaces (Conference Presentation)", "book_title": "High Contrast Metastructures VIII", "author": [ { "family_name": "Kafaie Shirmanesh", "given_name": "Ghazaleh", "orcid": "0000-0003-1666-3215", "clpid": "Kafaie-Shirmanesh-G" }, { "family_name": "Sokhoyan", "given_name": "Ruzan", "orcid": "0000-0003-4599-6350", "clpid": "Sokhoyan-R" }, { "family_name": "Wu", "given_name": "Pin Chieh", "orcid": "0000-0002-5781-9696", "clpid": "Wu-Pin-Chieh" }, { "family_name": "Atwater", "given_name": "Harry A.", "orcid": "0000-0001-9435-0201", "clpid": "Atwater-H-A" } ], "contributor": [ { "family_name": "Chang-Hasnain", "given_name": "Connie J.", "clpid": "Chang-Hasnain-C-J" }, { "family_name": "Faraon", "given_name": "Andrei", "clpid": "Faraon-A" }, { "family_name": "Zhou", "given_name": "Weimin", "clpid": "Zhou-Weimin" } ], "abstract": "In the last several years, metasurfaces have demonstrated promise to control constitutive properties of light via interaction with nanoscale elements. Unlike the passive metasurfaces developed to date, actively controlled metasurface properties can enable the realization of new electrically-tunable low-profile optical components with numerous applications such as dynamic holograms, convergent lenses with reconfigurable focal lengths, and beam steering arrays, which are key requirements for future chip-based light detection and ranging (LIDAR) systems. In this work, we report a gate-tunable reflectarray metasurface, which can act as a focusing lens with reconfigurable focal length or as a beam steering device. This active reflectarray metasurface is actively controlled by use of indium tin oxide (ITO) as a material with voltage-tunable complex permittivity at 1550 nm operating wavelength. First, we experimentally demonstrate electrical control of the reflection phase and amplitude for metasurface unit elements, and we show that the phase shift of the metasurface unit element can be actively tuned from 0\u00b0 to 300\u00b0. Our design enables independent electrical control of each metasurface element via individual application of the DC voltage. We also show that the same metasurface can exhibit multiple functionalities, acting both as a reconfigurable lens and a beam steering device.", "doi": "10.1117/12.2510673", "isbn": "9781510624986", "publisher": "Society of Photo-optical Instrumentation Engineers (SPIE)", "place_of_publication": "Bellingham, WA", "publication_date": "2019-03-08", "pages": "Art. No. 109280Q" }, { "id": "authors:a3phw-pja27", "collection": "authors", "collection_id": "a3phw-pja27", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20190822-134055268", "type": "book_section", "title": "Dielectric metasurfaces for spectroscopy and computational imaging (Conference Presentation)", "book_title": "High Contrast Metastructures VIII", "author": [ { "family_name": "Faraon", "given_name": "Andrei", "orcid": "0000-0002-8141-391X", "clpid": "Faraon-A" } ], "contributor": [ { "family_name": "Chang-Hasnain", "given_name": "Connie J.", "clpid": "Chang-Hasnain-C-J" }, { "family_name": "Faraon", "given_name": "Andrei", "clpid": "Faraon-A" }, { "family_name": "Zhou", "given_name": "Weimin", "clpid": "Zhou-Weimin" } ], "abstract": "I discuss our recent work on folded optics using metasurfaces and computational imaging.", "doi": "10.1117/12.2515106", "isbn": "9781510624986", "publisher": "Society of Photo-optical Instrumentation Engineers (SPIE)", "place_of_publication": "Bellingham, WA", "publication_date": "2019-03-08", "pages": "Art. No. 109280F" }, { "id": "authors:fejbn-2ve09", "collection": "authors", "collection_id": "fejbn-2ve09", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180628-153415654", "type": "book_section", "title": "Metasurfaces with controlled angular phase dispersion", "book_title": "High Contrast Metastructures VI", "author": [ { "family_name": "Kamali", "given_name": "Seyedeh Mahsa", "orcid": "0000-0002-6968-811X", "clpid": "Kamali-S-M" }, { "family_name": "Arbabi", "given_name": "Ehsan", "orcid": "0000-0002-5328-3863", "clpid": "Arbabi-E" }, { "family_name": "Arbabi", "given_name": "Amir", "orcid": "0000-0001-8831-7552", "clpid": "Arbabi-A" }, { "family_name": "Horie", "given_name": "Yu", "orcid": "0000-0001-7083-1270", "clpid": "Horie-Yu" }, { "family_name": "Faraon", "given_name": "Andrei", "orcid": "0000-0002-8141-391X", "clpid": "Faraon-A" } ], "contributor": [ { "family_name": "Chang-Hasnain", "given_name": "Connie J.", "clpid": "Chang-Hasnain-Connie-J" }, { "family_name": "Faraon", "given_name": "Andrei", "clpid": "Faraon-A" }, { "family_name": "Koyama", "given_name": "Fumio", "clpid": "Koyama-Fumio" }, { "family_name": "Zhou", "given_name": "Weimin", "clpid": "Zhou-Weimin" } ], "abstract": "Metasurfaces are two-dimensional arrangements of nano-scatterers that enable control of phase, amplitude, and polarization of light with high efficiency and subwavelength resolution. They have enabled diffractive optical elements with enhanced functionalities and performance. Nevertheless, metasurface diffractive optical elements share many of the properties of regular diffractive optical elements. One of these properties is the response of diffractive elements to changing the angle of illumination: if the beam incident on a grating is rotated by an angle, all diffraction orders will rotate by corresponding angles in the same direction. More precisely, because of the constant grating momentum, the change in the sine of all diffraction angles will be equal to the change in the sine of the illumination angle. Many optical devices of interest, however, do not require this type of behavior, which makes their implementation using metasurfaces very challenging. For instance retroreflectors, which reflect light incident from any angle to the same direction, or collimators, that deflect light coming from any angle to a single given direction, do not follow the regular diffractive optics angular response. We investigate properties of single-layer metasurfaces that enable devices like retroreflectors and collimators. We show that such metasurfaces should have the ability to control the phase, as well as the derivative of phase with respect to angle. We demonstrate designs that provide such control, and use them to show devices that defy the regular response of diffractive optical devices to changes in the illumination angle.", "doi": "10.1117/12.2255547", "isbn": "9781510606678", "publisher": "Society of Photo-optical Instrumentation Engineers (SPIE)", "place_of_publication": "Bellingham, WA", "publication_date": "2017-04-28", "pages": "Art. No. 101130Q" }, { "id": "authors:2mydv-4p417", "collection": "authors", "collection_id": "2mydv-4p417", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180628-153035007", "type": "book_section", "title": "Independent control of function and chromatic dispersion in diffractive optical devices with metasurfaces", "book_title": "High Contrast Metastructures VI", "author": [ { "family_name": "Arbabi", "given_name": "Ehsan", "orcid": "0000-0002-5328-3863", "clpid": "Arbabi-E" }, { "family_name": "Arbabi", "given_name": "Amir", "orcid": "0000-0001-8831-7552", "clpid": "Arbabi-A" }, { "family_name": "Kamali", "given_name": "Seyedeh Mahsa", "orcid": "0000-0002-6968-811X", "clpid": "Kamali-S-M" }, { "family_name": "Horie", "given_name": "Yu", "orcid": "0000-0001-7083-1270", "clpid": "Horie-Yu" }, { "family_name": "Faraon", "given_name": "Andrei", "orcid": "0000-0002-8141-391X", "clpid": "Faraon-A" } ], "contributor": [ { "family_name": "Chang-Hasnain", "given_name": "Connie J.", "clpid": "Chang-Hasnain-Connie-J" }, { "family_name": "Faraon", "given_name": "Andrei", "clpid": "Faraon-A" }, { "family_name": "Koyama", "given_name": "Fumio", "clpid": "Koyama-Fumio" }, { "family_name": "Zhou", "given_name": "Weimin", "clpid": "Zhou-Weimin" } ], "abstract": "Diffractive optical devices have many applications in various fields of optics. A fundamental property of all diffractive devices is their negative chromatic dispersion: a diffractive grating always disperses light in the opposite order compared to a refractive prism made of a material with positive (normal) dispersion. Unlike refractive devices, chromatic dispersion in diffractive devices stems from geometrical features, and cannot be controlled via the intrinsic material dispersion. In addition to the always negative sign, the amplitude of diffractive chromatic dispersion is set only by the function of the device. For instance, the angular dispersion of a grating is always given by d\u03b8/d\u03bb=tan(\u03b8)/\u03bb (where \u03b8 is the deflection angle and \u03bb is wavelength), or the focal distance dispersion of a diffractive lens is given by df/d\u03bb=-f/\u03bb. Therefore, the chromatic dispersion of diffractive devices has always been set by their function (e.g. by the deflection angle for a grating or the focal distance for a lens), and could not be controlled separately. Here, we present our work on breaking this fundamental relation between the function and chromatic dispersion of diffractive devices using metasurfaces providing independent control over phase and group delays. We use a reflective dielectric metasurface to experimentally demonstrate gratings and lenses that have positive, zero, and extraordinary negative chromatic dispersion. Apart from its fundamental scientific value, this concept expands the applications of diffractive devices as it enables various types of chromatic dispersions. For instance, a special case would be a dispersionless lens operating over a wide bandwidth with the same focal distance.", "doi": "10.1117/12.2253726", "isbn": "9781510606678", "publisher": "Society of Photo-optical Instrumentation Engineers (SPIE)", "place_of_publication": "Bellingham, WA", "publication_date": "2017-04-28", "pages": "Art. No. 101130P" }, { "id": "authors:wyaw4-wxp41", "collection": "authors", "collection_id": "wyaw4-wxp41", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20180628-154302818", "type": "book_section", "title": "Increasing efficiency of high-NA metasurface lenses", "book_title": "High Contrast Metastructures VI", "author": [ { "family_name": "Arbabi", "given_name": "Amir", "orcid": "0000-0001-8831-7552", "clpid": "Arbabi-A" }, { "family_name": "Arbabi", "given_name": "Ehsan", "orcid": "0000-0002-5328-3863", "clpid": "Arbabi-E" }, { "family_name": "Kamali", "given_name": "Seyedeh Mahsa", "orcid": "0000-0002-6968-811X", "clpid": "Kamali-S-M" }, { "family_name": "Horie", "given_name": "Yu", "orcid": "0000-0001-7083-1270", "clpid": "Horie-Yu" }, { "family_name": "Han", "given_name": "Seunghoon", "clpid": "Han-Seunghoon" }, { "family_name": "Faraon", "given_name": "Andrei", "orcid": "0000-0002-8141-391X", "clpid": "Faraon-A" } ], "contributor": [ { "family_name": "Chang-Hasnain", "given_name": "Connie J.", "clpid": "Chang-Hasnain-Connie-J" }, { "family_name": "Faraon", "given_name": "Andrei", "clpid": "Faraon-A" }, { "family_name": "Koyama", "given_name": "Fumio", "clpid": "Koyama-Fumio" }, { "family_name": "Zhou", "given_name": "Weimin", "clpid": "Zhou-Weimin" } ], "abstract": "Diffractive optical devices based on dielectric metasurfaces have recently attracted significant attention. Small size, low weight, planar form factor, and potential for low-cost manufacturing using semiconductor fabrication techniques are some of the main features that make metasurfaces ideal candidates for implementation of low-cost miniaturized optical systems. However, to become competitive for practical applications, metasurfaces should also offer specifications (e.g. efficiency, bandwidth, and wavefront error) comparable to their refractive counterparts. We have recently demonstrated diffraction-limited metasurface lenses with high efficiency using high refractive index nano-posts. Low numerical aperture (NA) metasurface lenses have more than 90% focusing efficiency, but the efficiency of the lenses with NA>0.5 decreases with increasing NA and drops to ~40% for NA=0.9, thus resulting in a trade-off between the NA and efficiency. Here we identify the main physical origin of this trade-off as the low transmission of large diameter nano-posts for transverse-magnetic (TM) polarized light incident at large angles, and show that the low transmission is caused by the excitation of undesired high order modes in these nano-posts. To overcome this issues, we present a novel approach for evaluating different metasurface designs in implementation of high NA metasurface components. The approach is based on adiabatic approximation of aperiodic metasurfaces by periodic gratings, and considers the effect of large deflection angles. Using the proposed design approach, we experimentally demonstrate more than 75% focusing efficiency for metasurface lenses with NA=0.7, and more than 70% deflection efficiency for 50-degree beam deflectors for unpolarized light at 915 nm.", "doi": "10.1117/12.2250391", "isbn": "9781510606678", "publisher": "Society of Photo-optical Instrumentation Engineers (SPIE)", "place_of_publication": "Bellingham, WA", "publication_date": "2017-04-28", "pages": "Art. No. 101130K" } ]