scholarly journals Numerical Investigation on a Hyperlens with a Large Radius Inner-Surface for Super-Resolution Imaging

Photonics ◽  
2020 ◽  
Vol 7 (4) ◽  
pp. 107
Author(s):  
Jiming Yang ◽  
Jiangtao Lv ◽  
Qiongchan Gu ◽  
Yu Ying ◽  
Xiaoxiao Jiang ◽  
...  
Keyword(s):  
Numerical Investigation ◽  
Resonant Cavity ◽  
Super Resolution ◽  
Large Radius ◽  
Inner Surface ◽  
Different Types ◽  
Resolution Imaging ◽  
Imaging Resolution ◽  
Sub Wavelength

Hyperlensing devices have drawn great attention in recent years due to their ability to amplify the subwavelength image of objects with more detail and information. In this work, a hyperlens with a radian inner surface is designed and demonstrated. The proposed hyperlens is capable of imaging different types of sub-wavelength objects efficiently. Plasmonic resonant cavity is also employed in order to achieve a super-resolution imaging effect. Different objects are investigated to test the performance of the proposed hyperlens. As expected, our hyperlens shows better tolerance than the conventional hyperlensing designs and can achieve imaging resolution down to 60 nm for different types of objects.

scholarly journals Generation and Detection of Structured Light: A Review

2021 ◽  
Vol 9 ◽  
Author(s):  
Jian Wang ◽  
Yize Liang
Keyword(s):  
Quantum Information Processing ◽  
Structured Light ◽  
Super Resolution ◽  
Research Progress ◽  
Free Space Optical ◽  
The Past ◽  
Integrated Devices ◽  
Different Types ◽  
Resolution Imaging ◽  
Light Beams

Structured light beams have rapidly advanced over the past few years, from specific spatial-transverse/longitudinal structure to tailored spatiotemporal structure. Such beams with diverse spatial structures or spatiotemporal structures have brought various breakthroughs to many fields, including optical communications, optical sensing, micromanipulation, quantum information processing, and super-resolution imaging. Thus, plenty of methods have been proposed, and lots of devices have been manufactured to generate structured light beams by tailoring the structures of beams in the space domain and the space–time domain. In this paper, we firstly give a brief introduction of different types of structured light. Then, we review the recent research progress in the generation and detection of structured light on different platforms, such as free space, optical fiber, and integrated devices. Finally, challenges and perspectives are also discussed.

Time-domain topological energy imaging with ultrasonic Lamb waves considering multiple defects

2020 ◽  
Vol 62 (4) ◽  
pp. 208-215
Author(s):  
Wenfa Zhu ◽  
Yujie Zhang ◽  
Guopeng Fan ◽  
Haiyan Zhang ◽  
Shao Wei
Keyword(s):  
Numerical Simulation ◽  
Time Domain ◽  
Lamb Waves ◽  
Super Resolution ◽  
Element Model ◽  
Rayleigh Criterion ◽  
Multiple Defects ◽  
Reference Medium ◽  
Resolution Imaging ◽  
Imaging Resolution

This study presents a fast imaging approach with ultrasonic Lamb waves based on time-domain topological energy to identify multiple defects with defect spacing smaller than the threshold of the Rayleigh criterion in terms of imaging resolution. The direct acoustical field and time-domain topological energy of the two fields are used as imaging functions when considering the calculation of direct and adjoint acoustical fields in a non-defective reference medium on the basis of topological theory. The functions are not limited by acoustic diffraction and can achieve super-resolution imaging with multiple defects. First, a 3D finite element model is established. Transient acoustic field diagrams at different moments are used to show the focusing process of direct and adjoint acoustical fields clearly with multiple defects, thereby revealing the physical mechanism of time-domain topological energy imaging. Second, the effectiveness of the proposed approach to characterise multiple defects when the defect spacing is smaller than the imaging resolution threshold is verified through numerical simulation. Finally, the feasibility of super-resolution imaging considering multiple defects is proven by conducting experiments on aluminium plate samples with multiple defects under different defect spacing conditions. Numerical simulation and experimental results show that the proposed approach can overcome the problem of multiple defects with defect spacing smaller than the imaging resolution threshold by breaking the Rayleigh criterion constraint, while the accuracy presented is higher than that of the traditional delay-and-sum method.

Localized plasmon assisted structured illumination microscopy for wide-field high-speed dispersion-independent super resolution imaging

Nanoscale ◽  
2014 ◽  
Vol 6 (11) ◽  
pp. 5807-5812 ◽  
Author(s):  
Joseph Louis Ponsetto ◽  
Feifei Wei ◽  
Zhaowei Liu
Keyword(s):  
Antenna Array ◽  
High Speed ◽  
Super Resolution ◽  
Fluorescent Imaging ◽  
Wide Field ◽  
Structured Illumination ◽  
Structured Illumination Microscopy ◽  
Resolution Imaging ◽  
Localized Plasmon ◽  
Imaging Resolution

Fluorescent imaging resolution down to 51 nm is shown by generating tunable localized plasmon excitations on a nano-antenna array.

Evanescent-Wave Reconstruction in Time Reversal System

Frequenz ◽  
2018 ◽  
Vol 72 (5-6) ◽  
pp. 285-292 ◽  
Author(s):  
Rui Zang ◽  
Bing-Zhong Wang ◽  
Shuai Ding ◽  
Zhi-Shuang Gong
Keyword(s):  
Time Reversal ◽  
Evanescent Wave ◽  
Super Resolution ◽  
New Method ◽  
Far Field ◽  
Initial Wave ◽  
Calculation Results ◽  
Resolution Imaging ◽  
Wave Conversion ◽  
Sub Wavelength

AbstractThe evanescent wave re-construction performance in the time reversal system with periodic sub-wavelength grating is studied in this paper. Both the analysis and calculation results show that the evanescent components of the initial wave can’t be re-constructed directly by far field time reversal processing. The results indicate the uncertainty of the super-resolution performance of the time reversal technique with randomly arranged scatters. A new method to achieve super-resolution imaging by using evanescent-to-propagation wave conversion also been proposed at the end of this paper.

Far-Field Super-Resolution Imaging of Nano-transparent Objects by Hyperlens with Plasmonic Resonant Cavity

Plasmonics ◽  
2015 ◽  
Vol 11 (2) ◽  
pp. 475-481 ◽  
Author(s):  
Kai Yan ◽  
Ling Liu ◽  
Na Yao ◽  
Kaipeng Liu ◽  
Wenjuan Du ◽  
...  
Keyword(s):  
Resonant Cavity ◽  
Super Resolution ◽  
Far Field ◽  
Transparent Objects ◽  
Resolution Imaging
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