scholarly journals Sub-Diffraction-Limit Imaging System with two Interfacing Hyperbolic Metamaterials

2021 ◽  
Vol 16 (4) ◽  
Author(s):  
Kirill Bronnikov ◽  
Jesús Arriaga ◽  
Arkadii Krokhin ◽  
Vladimir P. Drachev
Keyword(s):  
Imaging System ◽  
Diffraction Limit ◽  
Hyperbolic Metamaterials

scholarly journals Deep Subwavelength Power Concentration-Based Hyperbolic Metamaterials

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Amanpreet Kaur ◽  
Saptarshi Banerjee ◽  
Wangshi Zhao ◽  
Jayanti Venkataraman ◽  
Zhaolin Lu
Keyword(s):  
Electromagnetic Waves ◽  
Light Propagation ◽  
Spot Size ◽  
Diffraction Limit ◽  
Evanescent Waves ◽  
Hyperbolic Metamaterials ◽  
Preferred Direction ◽  
Propagating Waves ◽  
Medium Design ◽  
Collimated Beam

Hyperbolic metamaterials can manipulate electromagnetic waves by converting evanescent waves into propagating waves and thus support light propagation without diffraction limit. In this paper, deep subwavelength focusing (or power concentration) is demonstrated both numerically and experimentally using hyperbolic metamaterials. The results verify that hyperbolic metamaterials can focus a broad collimated beam to spot size of ~λ0/6 using wired medium design for both normal and oblique incidence. The nonmagnetic design, no-cut-off operation, and preferred direction of propagation in these materials significantly reduce the attenuation in electromagnetic waves.

scholarly journals Ultra-Thin Chiral Metasurface-Based Superoscillatory Lens

2022 ◽  
Vol 8 ◽  
Author(s):  
Jinxing Li ◽  
Guohui Yang ◽  
Yueyi Yuan ◽  
Qun Wu ◽  
Kuang Zhang
Keyword(s):  
High Efficiency ◽  
Imaging System ◽  
Focal Depth ◽  
Dielectric Substrate ◽  
Diffraction Limit ◽  
Ring Resonators ◽  
Center Frequency ◽  
Full Wave ◽  
Low Profile ◽  
Unit Cells

The metasurface-based superoscillatory lens has been demonstrated to be effective in finely tailoring the wavefront of light to generate focal spots beyond the diffraction limit in the far-field that is capable of improving the resolution of the imaging system. In this paper, an ultra-thin (0.055 λ0) metasurface-based superoscillatory lens (SOL) that can generate a sub-diffraction optical needle with a long focal depth is proposed, which is constructed by ultra-thin chiral unit cells containing two metal split-ring resonators (SRR) with a 90° twisted angle difference cladded on both sides of a 1.5 mm-thick dielectric substrate, with a high linear cross-polarized transmission coefficient around 0.9 and full phase control capability at 11 GHz. Full-wave simulation shows that SOL generates a sub-diffraction optical needle within 10.5–11.5 GHz. At the center frequency, the focal depth is 281 mm (10.3 λ0) within 105–386 mm, the full width at half maximum (FWHM) is 18.5 mm (0.68 λ0), about 0.7 times the diffraction limit, generally consistent with the theoretical result. The proposed ultra-thin chiral metasurface-based SOL holds great potential in integrating into practical imaging applications for its simple fabrication, high efficiency, and low-profile advantages.

Sub-Diffraction Limit Three Dimensional Particle Tracking Velocimetry

2013 ◽  
Author(s):  
Craig A. Snoeyink ◽  
Gordon Christopher ◽  
Sourav Barman ◽  
Steve Wereley
Keyword(s):  
Imaging System ◽  
Optical Measurement ◽  
Single Point ◽  
Bessel Beam ◽  
Three Dimensional ◽  
Diffraction Limit ◽  
Point Of View ◽  
Three Dimensions ◽  
Three Dimension ◽  
Single View

Here we present an optical measurement technique and image analysis process capable of tracking particles in three dimensions with a single point of view. In addition to single view 3D-PTV, the optical system is capable of tracking individual particles even at particle-particle spacings that are closer then the diffraction limit of the base imaging system. The measurement system, termed Bessel Beam Microscopy (BBM), functions as an attachment for a microscope that fits between the microscope base and camera. The addition of the BBM attachment transforms the point spread function (PSF) of the microscope allowing two unique functions: single image superresolution imaging, and the extraction of three dimension location information of particles without calibration. The result is a fluid characterization tool with unique capabilities for velocimetry and characterization of the dynamics of dense fluid-particle suspensions.

scholarly journals Super-Resolution Remote Imaging Using Time Encoded Remote Apertures

2020 ◽  
Vol 10 (18) ◽  
pp. 6458 ◽  
Author(s):  
Ji Hyun Nam ◽  
Andreas Velten
Keyword(s):  
Imaging System ◽  
Super Resolution ◽  
Diffraction Limit ◽  
Imaging Method ◽  
Spatial Average ◽  
Spatial Profile ◽  
Remote Imaging ◽  
Temporal Profile ◽  
Wavelength Scale ◽  
Wave Phenomena

Imaging of scenes using light or other wave phenomena is subject to the diffraction limit. The spatial profile of a wave propagating between a scene and the imaging system is distorted by diffraction resulting in a loss of resolution that is proportional with traveled distance. We show here that it is possible to reconstruct sparse scenes from the temporal profile of the wave-front using only one spatial pixel or a spatial average. The temporal profile of the wave is not affected by diffraction yielding an imaging method that can in theory achieve wavelength scale resolution independent of distance from the scene.

Nanofocusing of circularly polarized Bessel-type plasmon polaritons with hyperbolic metamaterials

2017 ◽  
Vol 4 (2) ◽  
pp. 290-296 ◽  
Author(s):  
Ling Liu ◽  
Ping Gao ◽  
Kaipeng Liu ◽  
Weijie Kong ◽  
Zeyu Zhao ◽  
...  
Keyword(s):  
Bessel Beam ◽  
Diffraction Limit ◽  
Hyperbolic Metamaterials ◽  
Circularly Polarized ◽  
Lateral Dimension ◽  
Plasmon Polaritons

An evanescent Bessel beam with a lateral dimension beyond the diffraction limit is generated by combining plasmonic metasurfaces and hyperbolic metamaterials.

scholarly journals Infrared non-invasive sub-wavelength microscopy with metamaterials

Eureka ◽  
2012 ◽  
Vol 3 (1) ◽  
pp. 11-18
Author(s):  
Ward D Newman
Keyword(s):  
Effective Medium Theory ◽  
Design Method ◽  
High Spatial Frequency ◽  
Diffraction Limit ◽  
Classical Electrodynamics ◽  
Medium Theory ◽  
Hyperbolic Metamaterials ◽  
Conventional Microscopy ◽  
And Performance ◽  
Sub Wavelength

I demonstrate that hyperbolic metamaterials may provide the solution to the long-standing prob- lem of the fundamental diffraction limit plaguing conventional microscopy and optical imaging sys- tems. Presented here is the formalism of the theory, classical electrodynamics, used to describe the diffraction limit and sub-wavelength imaging using hyperbolic metamaterials. Effective medium theory is then derived and put forth as a design method for such hyperbolic metamaterials. I then outline the design of a planar device based on a hyperbolic metamaterial for use in infrared mi- croscopy, and present numerical simulations to demonstrate the behaviour and performance of the device. The device employs multilayers of InGaAs/AlInAs and is capable of sub-diffraction imaging resolution in the wavelength range of 8.8 - 10.5 μm. I show that high spatial frequency waves, which normally decay in vacuum, are allowed to propagate and reach the far-field in a hyperbolic meta- material. Using a Green’s function formalism to describe optical sources, sub-wavelength imaging capabilities of hyperbolic metamaterials is shown. Finally, potential device applications using the designed metamaterial are motivated.

Sub-wavelength Imaging through Metallic Nanorod Array

2006 ◽  
Vol 919 ◽  
Author(s):  
Atsushi Ono ◽  
Jun-ichi Kato ◽  
Satoshi Kawata
Keyword(s):  
Imaging System ◽  
Near Field ◽  
Nanorod Array ◽  
Diffraction Limit ◽  
Localized Surface Plasmon ◽  
Negative Index ◽  
Negative Index Material ◽  
Frequency Regime ◽  
Dipole Sources ◽  
Sub Wavelength

AbstractNegative index material is expected to exhibit interesting optical properties. Especially, superlens effect, which is predicted by John B. Pendry in 2000, is very attractive to overcome the diffraction limit in optical imaging [1]. Although there is no negative index material in nature, Pendry numerically suggested that several metals, only dielectric constant is negative at optical frequencies, behave like a superlens under the electrostatic limit and for the p-polarized fields. X. Zhang experimentally demonstrated this superlens effect by constructing nanolithography system with silver thin film in 2005 [2].In this presentation, we newly propose a sub-wavelength imaging system at optical frequency regime in an array of metallic nanorods [3]. The near-field components of dipole sources were plasmonically transferred through the rod array to reproduce the image of the dipoles in the other side.We calculated the field distribution at the different planes of imaging process using the finite-difference time-domain (FDTD) algorithm and found that the spatial resolution was 40 nm, which was much beyond the diffraction-limit and was limited by the array pitch. The typical configuration is a hexagonal arrangement with 40 nm periodicity of silver rods of 50 nm height and 20 nm diameter. The image formation highly depends on the coherence and the polarization of the dipole sources, array pitch, and the source-array distance. The principle of our near-field imaging is based on the longitudinal resonance of the localized surface plasmon along a metallic nanorod. The spectral responses of the device are also investigated.

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