Optimization of light delivery by a nanowire-based single cell optical endoscope

Ladanov, Mikhail; Cheemalapati, Surya; Pyayt, Anna

doi:10.1364/oe.21.028001

Cited by 6 publications

(4 citation statements)

References 44 publications

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“…Conventional lenses are fabricated through a subtractive process, involving material cutting, surface grinding, and fine polishing. However, the traditional fabrication methods cannot be applied as lenses shrink in size for miniaturizing optical systems, for example, for use in endoscopes [1][2][3] and on-chip optical interconnects. [4][5][6] Recently, optical metasurfaces have emerged as an alternative approach for realizing compact and planar optics, including axicons, [7] blazed gratings, [8][9][10][11][12] polarization control plates, [13][14][15] holographic plates, [16] and flat lenses.…”

Section: Introductionmentioning

confidence: 99%

Single‐Layer Aberration‐Compensated Flat Lens for Robust Wide‐Angle Imaging

Hao

Gao

Ruan

et al. 2020

Laser & Photonics Reviews

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Metasurfaces are planarized and miniaturized versions of conventional optical elements. Subwavelength‐thick single‐layer metalenses have diffraction limited resolution for on‐axis imaging but relatively low resolution for off‐axis imaging due to off‐axial aberrations. The aberrations of planar single‐layer metalenses have been corrected by patterning two metasurfaces on both sides of a substrate to form metalens doublets with a thickness of hundreds of micrometers to millimeters. The multilevel diffractive lenses are demonstrated to achieve wide angle imaging with a thickness of several micrometers, however, the off‐axial aberrations are not compensated. Here, an epsilon‐greedy algorithm‐based scheme for achieving a planar wavelength‐thick single‐layer aberration‐compensated (SLAC) flat lens consisting of dielectric nanoring structures fabricated by 3D printing are proposed. The scheme is experimentally validated via a SLAC flat lens. This SLAC flat lens has a thickness of 1 µm, a numerical aperture of 0.45, a focal length of 1 mm, a full field of view (FOV) of 32° that enables aberration‐compensated imaging along the focal plane and monochromatic microscopic imaging with resolution better than 2.2 µm at a wavelength of 633 nm. This scheme can lead to ultrathin wide‐FOV flat lens designs as well as low‐cost mass production, which has various applications in miniscopes, mobile camera modules, and machine vision.

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Section: Introductionmentioning

confidence: 99%

Single‐Layer Aberration‐Compensated Flat Lens for Robust Wide‐Angle Imaging

Hao

Gao

Ruan

et al. 2020

Laser & Photonics Reviews

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“…Among them, nanowire-based waveguide devices offer promising routes for achieving subwavelength confinement and low-loss propagation at the same time [8,9,13–15]. Dielectric materials of high refractive index were also proposed as the core of a waveguide to obtain effective subwavelength guiding [18–23], and efficient guiding of visible light through ZnO nanowire waveguides in a silver film was demonstrated [24]. These nanowire waveguides are fabricated using randomly distributed ZnO nanowires synthesized via the hydrothermal method on a glass substrate pre-seeded with ZnO nanoparticles [25].…”

Section: Introductionmentioning

confidence: 99%

Patterned synthesis of ZnO nanorod arrays for nanoplasmonic waveguide applications

Lamson

Khan

Wang

et al. 2018

Optics Communications

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We report the patterned synthesis of ZnO nanorod arrays of diameters between 50 nm and 130 nm and various spacings. This was achieved by patterning hole arrays in a polymethyl methacrylate layer with electron beam lithography, followed by chemical synthesis of ZnO nanorods in the patterned holes using the hydrothermal method. The fabrication of ZnO nanorod waveguide arrays is also demonstrated by embedding the nanorods in a silver film using the electroplating process. Optical transmission measurement through the nanorod waveguide arrays is performed and strong resonant transmission of visible light is observed. We have found the resonance shifts to a longer wavelength with increasing nanorod diameter. Furthermore, the resonance wavelength is independent of the nanowaveguide array period, indicating the observed resonant transmission is the effect of a single ZnO nanorod waveguide. These nanorod waveguides may be used in single-molecule imaging and sensing as a result of the nanoscopic profile of the light transmitted through the nanorods and the controlled locations of these nanoscale light sources.

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“…There are various numerical techniques that have been used to study the optical response of metal nanostructures like Tmatrix [31], discrete dipole approximation (DDA) [32], finitedifference time-domain (FDTD) method [33,34], and finite element method (FEM) [35]. DDA is one of the most frequently used numerical techniques for computing optical properties such as scattering and absorption by arbitrary size, shape nanogeometry.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Broadband Scattering by Coated and Noncoated Metal Nanostructures Using Discrete Dipole Approximation Method

Roopak

Pathak

et al. 2015

Plasmonics

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We suggest numerical method to study the optical response of metal nanostructures. The analysis of optical properties such as scattering and absorption by coated and noncoated nanogeometry has been done using discrete dipole approximation (DDA) method. The core-shell nanogeometry supports surface plasmon resonances, which are highly tunable from 400 to 1100 nm. The tunability of surface plasmon resonance (SPR) highly depends on the structural anisotropy and chosen core-shell material. Further, we have observed that aspect ratio is one of the key parameter to decide the nature and position of the plasmonic peaks and magnitude of optical cross section. We have also shown that coated nanospheroid is a more appropriate geometry as compared to coated nanosphere and noncoated nanospheroid in terms of wide tunability of surface plasmon resonance. The wide tunability in SPR is observed for the effective radii 90 nm core-shell (Au@SiO 2 ) nanospheroid with aspect ratio 0.1.

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Optimization of light delivery by a nanowire-based single cell optical endoscope

Cited by 6 publications

References 44 publications

Single‐Layer Aberration‐Compensated Flat Lens for Robust Wide‐Angle Imaging

Single‐Layer Aberration‐Compensated Flat Lens for Robust Wide‐Angle Imaging

Patterned synthesis of ZnO nanorod arrays for nanoplasmonic waveguide applications

Numerical Simulation of Broadband Scattering by Coated and Noncoated Metal Nanostructures Using Discrete Dipole Approximation Method

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