Near-infrared Plasmonic Far-field Nanofocusing Effects with Elongated Depth of Focus based on Hybrid Au–Dielectric–Ag Subwavelength Structures

Plasmonics ◽  
2016 ◽  
Vol 11 (5) ◽  
pp. 1219-1231 ◽  
Author(s):  
Pengfei Cao ◽  
Lin Cheng ◽  
Xiaoping Zhang ◽  
Xuelin Huang ◽  
Hongmei Jiang
Keyword(s):  
Near Infrared ◽  
Subwavelength Structures ◽  
Far Field ◽  
Depth Of Focus

Polarization-Resolved Near- and Far-Field Radiation from Near-Infrared Tilted Fiber Bragg Gratings

2014 ◽  
Vol 32 (11) ◽  
pp. 2157-2162 ◽  
Author(s):  
Changyu Shen ◽  
Lingyun Xiong ◽  
Aliaksander Bialiayeu ◽  
Yang Zhang ◽  
Jacques Albert
Keyword(s):  
Near Infrared ◽  
Fiber Bragg Gratings ◽  
Bragg Gratings ◽  
Far Field ◽  
Field Radiation

scholarly journals Experimental Demonstration of Total Absorption over 99% in the Near Infrared for Monolayer‐Graphene‐Based Subwavelength Structures

2016 ◽  
Vol 4 (12) ◽  
pp. 1955-1960 ◽  
Author(s):  
Chu‐Cai Guo ◽  
Zhi‐Hong Zhu ◽  
Xiao‐Dong Yuan ◽  
Wei‐Min Ye ◽  
Ken Liu ◽  
...  
Keyword(s):  
Near Infrared ◽  
Monolayer Graphene ◽  
Subwavelength Structures ◽  
Total Absorption ◽  
Experimental Demonstration

scholarly journals Robust Conformal Perfect Absorber Involving Lossy Ultrathin Film

Photonics ◽  
2020 ◽  
Vol 7 (3) ◽  
pp. 57
Author(s):  
Lei Zhang ◽  
Kun Wang ◽  
Hui Chen ◽  
Yanpeng Zhang
Keyword(s):  
Near Infrared ◽  
Incident Angle ◽  
Broad Band ◽  
Infrared Range ◽  
Subwavelength Structures ◽  
Perfect Absorber ◽  
Perfect Absorption ◽  
Absorption Performance ◽  
Near Infrared Range ◽  
Lossy Material

Perfect absorbers have been extensively investigated due to their significant value in solar cell, photodetection, and stealth technologies. Various subwavelength structures have been proposed to improve the absorption performances, such as high absorptance, broad band, and wide absorption angle. However, excellent performances usually put forward higher requirements on structural designs, such as varying the geometry sizes or shapes to fit different center wavelengths, which inevitably increases the fabrication burden. Here, a planar sandwich structure involving a layer of highly lossy material is proposed to achieve a robust perfect absorption with 95% absorptance ranging from the visible to near infrared range. Such an excellent absorption performance is also polarization-independent and applicable to a wide incident angle. Furthermore, the proposed design can also be applied to conformal surfaces with a 90% fluctuation over a steep surface. We believe that the proposed perfect absorber with distinguished performances can find wide application.

Angle control of far-field scattering based on all dielectric transmissive geometric phase metasurface in near-infrared region

Laser Physics ◽  
2021 ◽  
Vol 31 (11) ◽  
pp. 116202
Author(s):  
Chengyang Li ◽  
Yiyun Li ◽  
Bo Fang ◽  
Chenxia Li ◽  
Xufeng Jing ◽  
...  
Keyword(s):  
Geometric Phase ◽  
Near Infrared ◽  
Infrared Region ◽  
Far Field ◽  
Near Infrared Region

scholarly journals Cu(In,Ga)Se2 Solar Cells Integrated with Subwavelength Structured Cover Glass Fabricated by One-Step Self-Masked Etching

Micromachines ◽  
2020 ◽  
Vol 11 (9) ◽  
pp. 877
Author(s):  
Ho-Jung Jeong ◽  
Ye-Chan Kim ◽  
Sung-Tae Kim ◽  
Min-Ho Choi ◽  
Young-Hyun Song ◽  
...  
Keyword(s):  
Solar Cells ◽  
Solar Cell ◽  
Near Infrared ◽  
Short Circuit ◽  
Short Circuit Current ◽  
Subwavelength Structures ◽  
Cover Glass ◽  
Cigs Thin Film ◽  
Average Transmittance ◽  
One Step

We report an anti-reflective cover glass for Cu(In,Ga)Se2 (CIGS) thin film solar cells. Subwavelength structures (SWSs) were fabricated on top of a cover glass using one-step self-masked etching. The etching method resulted in dense whiskers with high aspect ratio. The produced structure exhibited excellent anti-reflective properties over a broad wavelength range, from the ultraviolet to the near infrared. Compared to a flat-surface glass, the average transmittance of the glass integrated with the SWSs improved from 92.4% to 95.2%. When the cover glass integrated with the SWSs was mounted onto the top of a CIGS device, the short-circuit current and the efficiency of the solar cell were enhanced by 4.38 and 6%, respectively, compared with a CIGS solar cell without cover glass.

scholarly journals Nonlinear imaging of whispering gallery modes in GaN microwires

2021 ◽  
Vol 2015 (1) ◽  
pp. 012015
Author(s):  
Yury Berdnikov ◽  
Igor Shtrom ◽  
Maria Rozhavskaya ◽  
Wsevolod Lundin ◽  
Nicholas Hendricks ◽  
...  
Keyword(s):  
Optical Microscopy ◽  
Nonlinear Optical ◽  
Near Infrared ◽  
Whispering Gallery Modes ◽  
Far Field ◽  
Green Luminescence ◽  
Nonlinear Optical Microscopy ◽  
Whispering Gallery ◽  
Infrared Excitation ◽  
Nonlinear Imaging

Abstract In this work non-scanning far-field nonlinear optical microscopy is employed to study the whispering gallery modes in tapered GaN microwire resonators. We demonstrate the confinement of whispering gallery modes under near-infrared excitation with the photon energy close to half of GaN bandgap. Our results indicate the enhancement of yellow-green luminescence by whispering gallery modes in GaN microwires.

scholarly journals Reconfiguration of the Pattern and Transmission Spectrum in Near Infrared Band by Plasmon Nano-Optical Antenna

2019 ◽  
Author(s):  
Dong-zhou Zhong ◽  
Hua Yang ◽  
Neng Zeng ◽  
Guang-Ze Yang ◽  
Jun-Long Zhou
Keyword(s):  
Transmission Spectrum ◽  
Near Infrared ◽  
Near Field ◽  
Field Pattern ◽  
Optical Antenna ◽  
Far Field ◽  
Infrared Band ◽  
Yagi Antenna ◽  
Field Radiation ◽  
Far Field Pattern

We propose a novel plasmon nano-optical antenna that consists of three vertically superimposed discs with different materials. Two symmetrical nanometer-scale Yagi antenna elements with gold-material are embedded into the surface of the middle disc with silicon dioxide. Based on plasmon theory and Yagi antenna principle, we explore the properties of the far-field radiation and near-field transmission of the antenna in near infrared band. It is found that the pattern of the xoy plane in the antenna can be adjusted in arbitrary direction. The far-field pattern and near-field transmission spectrum can be reconfigured by changing the angle a of the Yagi antenna elements in the middle disc. Moreover, we also discuss the influences of the widths and lengths of the elements on the near-field transmission spectrum when a is fixed at 0 degree.

Enhanced Optical Transmission Assisted Near-Infrared Plasmonic Optical Filter via Hybrid Subwavelength Structures

Plasmonics ◽  
2019 ◽  
Vol 14 (6) ◽  
pp. 1649-1657 ◽  
Author(s):  
Kui Wen ◽  
Xiao-Qing Luo ◽  
Zhiyong Chen ◽  
Weihua Zhu ◽  
Wei Guo ◽  
...  
Keyword(s):  
Optical Transmission ◽  
Near Infrared ◽  
Optical Filter ◽  
Subwavelength Structures ◽  
Enhanced Optical Transmission

scholarly journals Rainbow Archimedean spiral emission from optical fibres

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
F. Mangini ◽  
M. Ferraro ◽  
M. Zitelli ◽  
V. Kalashnikov ◽  
A. Niang ◽  
...  
Keyword(s):  
Laser Beam ◽  
Optical Tweezers ◽  
Laser Power ◽  
Near Infrared ◽  
Laser Source ◽  
Optical Fibres ◽  
Far Field ◽  
Archimedean Spiral ◽  
Spiral Shape ◽  
Helical Beam

AbstractWe demonstrate a new practical approach for generating multicolour spiral-shaped beams. It makes use of a standard silica optical fibre, combined with a tilted input laser beam. The resulting breaking of the fibre axial symmetry leads to the propagation of a helical beam. The associated output far-field has a spiral shape, independently of the input laser power value. Whereas, with a high-power near-infrared femtosecond laser, a visible supercontinuum spiral emission is generated. With appropriate control of the input laser coupling conditions, the colours of the spiral spatially self-organize in a rainbow distribution. Our method is independent of the laser source wavelength and polarization. Therefore, standard optical fibres may be used for generating spiral beams in many applications, ranging from communications to optical tweezers and quantum optics.

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