scholarly journals Phase-Controlled Planar Metalenses for High-Resolution Terahertz Focusing

Photonics ◽  
2021 ◽  
Vol 8 (5) ◽  
pp. 143
Author(s):  
Xin Yu ◽  
Yun Shen ◽  
Guohong Dai ◽  
Liner Zou ◽  
Tailin Zhang ◽  
...  
Keyword(s):  
High Resolution ◽  
Spatial Resolution ◽  
Imaging System ◽  
Incident Light ◽  
Near Field ◽  
Numerical Aperture ◽  
Full Width ◽  
Half Maximum ◽  
Near Field Imaging ◽  
Field Imaging

We experimentally demonstrate that high-resolution terahertz focusing can be realized in planar metalenses, which consist of arrays of different V-shaped antenna units on a silicon substrate. Numerical results show that a larger numerical aperture of metalenses can provide smaller full width at half maximum of field distribution, leading to higher spatial resolution. The measurement of fabricated metalenses samples was performed by a terahertz near-field imaging system, and experimental results agree well with the numerical prediction. Especially for 1.1 THz incident light, when the numerical aperture increases from 0.79 to 0.95, the full width at half maximum correspondingly decreases from 343 μm to 206 μm, offering an improvement of spatial resolution.

Ultra-Wide Band Near-Field Imaging System

2007 ◽  
Author(s):  
Anatoliy O. Boryssenko ◽  
Christophe Craeye ◽  
Daniel H. Schaubert
Keyword(s):  
Imaging System ◽  
Near Field ◽  
Wide Band ◽  
Ultra Wide Band ◽  
Near Field Imaging ◽  
Field Imaging

Three-Dimensional Finite-Difference Time-Domain Method Modeling of Nanowire Optical Probe

2014 ◽  
Vol 602-605 ◽  
pp. 3359-3362
Author(s):  
Chun Li Zhu ◽  
Jing Li
Keyword(s):  
Finite Difference ◽  
Time Domain ◽  
Finite Difference Time Domain ◽  
Incident Light ◽  
Near Field ◽  
Three Dimensional ◽  
Polarization Direction ◽  
Near Field Imaging ◽  
Difference Time ◽  
Field Imaging

In this paper, output near fields of nanowires with different optical and structure configurations are calculated by using the three-dimensional finite-difference time-domain (3D FDTD) method. Then a nanowire with suitable near field distribution is chosen as the probe for scanning dielectric and metal nanogratings. Scanning results show that the resolution in near-field imaging of dielectric nanogratings can be as low as 80nm, and the imaging results are greatly influenced by the polarization direction of the incident light. Compared with dielectric nanogratings, metal nanogratings have significantly enhanced resolutions when the arrangement of gratings is perpendicular to the polarization direction of the incident light due to the enhancement effect of the localized surface plasmons (SPs). Results presented here could offer valuable references for practical applications in near-field imaging with nanowires as optical probes.

High-Resolution UHF Near-Field Imaging Probe

2018 ◽  
Vol 67 (10) ◽  
pp. 2353-2362 ◽  
Author(s):  
Mohamed A. Abou-Khousa ◽  
K. T. Muhammed Shafi ◽  
Xie Xingyu
Keyword(s):  
High Resolution ◽  
Near Field ◽  
Imaging Probe ◽  
Near Field Imaging ◽  
Field Imaging

scholarly journals A study on the realization of high resolution solid immersion lens-based near-field imaging optics by use of an annular aperture

2010 ◽  
Vol 18 (16) ◽  
pp. 17533 ◽  
Author(s):  
Hyungbae Moon ◽  
Yong-Joong Yoon ◽  
Wan-Chin Kim ◽  
No-Cheol Park ◽  
Kyoung-Su Park ◽  
...  
Keyword(s):  
High Resolution ◽  
Near Field ◽  
Solid Immersion Lens ◽  
Near Field Imaging ◽  
Annular Aperture ◽  
Field Imaging ◽  
Imaging Optics

Aperture synthesis with a monochromatic metasurface imaging system for 3D near-field imaging

2018 ◽  
Author(s):  
Michael Boyarsky ◽  
Timothy Sleasman ◽  
Laura Pulido-Mancera ◽  
Aaron V. Diebold ◽  
Mohammadreza F. Imani ◽  
...  
Keyword(s):  
Imaging System ◽  
Near Field ◽  
Aperture Synthesis ◽  
Near Field Imaging ◽  
Field Imaging

Near-Field Scanning Optical Microscopy

1987 ◽  
Vol 45 ◽  
pp. 184-187
Author(s):  
E. Betzig ◽  
M. Isaacson ◽  
A. Lewis ◽  
K. Lin
Keyword(s):  
Spatial Resolution ◽  
Structural Damage ◽  
Near Field ◽  
Far Field ◽  
Resolution Limit ◽  
Field Methods ◽  
General Applicability ◽  
Minimal Sample ◽  
Near Field Imaging ◽  
Field Imaging

The spatial resolution of most of the imaging or microcharacterization methods presently in use are fundamentally limited by the wavelength of the exciting or the emitted radiation being used. In general, the smaller the wavelength of the exciting probe, the greater the structural damage to the sample under study. Thus, the requirements of minimal sample alteration and high spatial resolution seem to be at odds with one another.However, the reason for this wavelength resolution limit is due to the far field methods for producing or detecting the radiation of interest. If one does not use far field optics, but rather the method of near field imaging, the spatial resolution attainable can be much smaller than the wavelength of the radiation used. This method of near field imaging has a general applicability for all wave probes.

Ultra wideband compact near‐field imaging system for breast cancer detection

2015 ◽  
Vol 9 (10) ◽  
pp. 1009-1014 ◽  
Author(s):  
Malyhe Jalilvand ◽  
Xuyang Li ◽  
Lukasz Zwirello ◽  
Thomas Zwick
Keyword(s):  
Breast Cancer ◽  
Cancer Detection ◽  
Imaging System ◽  
Near Field ◽  
Breast Cancer Detection ◽  
Ultra Wideband ◽  
Near Field Imaging ◽  
Field Imaging
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