Nanostructured graphene-based hyperbolic metamaterial performing as a wide-angle near infrared electro-optical switch

2015 ◽  
Vol 54 (5) ◽  
pp. 1206 ◽  
Author(s):  
Maziar Shoaei ◽  
Mohammad Kazem Moravvej-Farshi ◽  
Leila Yousefi
Keyword(s):  
Near Infrared ◽  
Optical Switch ◽  
Wide Angle ◽  
Hyperbolic Metamaterial

scholarly journals Wide-angle near infrared polarizer with extremely high extinction ratio

2013 ◽  
Vol 21 (9) ◽  
pp. 10502 ◽  
Author(s):  
X. L. Liu ◽  
B. Zhao ◽  
Z. M. Zhang
Keyword(s):  
Near Infrared ◽  
Extinction Ratio ◽  
Wide Angle ◽  
High Extinction Ratio

scholarly journals All-Optical Reversible Logic Gates with Optically Controlled Bacteriorhodopsin Protein-Coated Microresonators

2012 ◽  
Vol 2012 ◽  
pp. 1-12 ◽  
Author(s):  
Sukhdev Roy ◽  
Purnima Sethi ◽  
Juraj Topolancik ◽  
Frank Vollmer
Keyword(s):  
Low Power ◽  
Power Control ◽  
Near Infrared ◽  
Optical Switch ◽  
Logic Gates ◽  
Single Mode ◽  
Practical Applications ◽  
Control Signals ◽  
All Optical ◽  
Reversible Logic Gates

We present designs of all-optical reversible gates, namely, Feynman, Toffoli, Peres, and Feynman double gates, with optically controlled microresonators. To demonstrate the applicability, a bacteriorhodopsin protein-coated silica microcavity in contact between two tapered single-mode fibers has been used as an all-optical switch. Low-power control signals (<200 μW) at 532 nm and at 405 nm control the conformational states of the protein to switch a near infrared signal laser beam at 1310 or 1550 nm. This configuration has been used as a template to design four-port tunable resonant coupler logic gates. The proposed designs are general and can be implemented in both fiber-optic and integrated-optic formats and with any other coated photosensitive material. Advantages of directed logic, high Q-factor, tunability, compactness, low-power control signals, high fan-out, and flexibility of cascading switches in 2D/3D architectures to form circuits make the designs promising for practical applications.

scholarly journals Wide-angle broadband absorber based on uniform-sized hyperbolic metamaterial

2018 ◽  
Vol 8 (9) ◽  
pp. 2484 ◽  
Author(s):  
Yan-Lin Liao ◽  
Yan Zhao ◽  
Shan Wu ◽  
Sujuan Feng
Keyword(s):  
Wide Angle ◽  
Broadband Absorber ◽  
Hyperbolic Metamaterial

Active tuning of epsilon-near-zero point of hyperbolic metamaterial at visible and near-infrared regimes

2016 ◽  
Vol 9 (9) ◽  
pp. 092201 ◽  
Author(s):  
Hao Wang ◽  
Hua Zhao ◽  
Hang Su ◽  
Guangwei Hu ◽  
Jingwen Zhang
Keyword(s):  
Near Infrared ◽  
Zero Point ◽  
Hyperbolic Metamaterial ◽  
Epsilon Near Zero

scholarly journals A simple Mie-resonator based meta-array with diverse deflection scenarios enabling multifunctional operation at near-infrared

Nanophotonics ◽  
2020 ◽  
Vol 9 (15) ◽  
pp. 4589-4600
Author(s):  
Majid Aalizadeh ◽  
Andriy E. Serebryannikov ◽  
Ekmel Ozbay ◽  
Guy A. E. Vandenbosch
Keyword(s):  
Near Infrared ◽  
Specular Reflection ◽  
Polarization State ◽  
Diffraction Order ◽  
Spatial Filtering ◽  
Zero Order ◽  
Ultra Wideband ◽  
Wide Angle ◽  
Large Area ◽  
Phase Gradient

AbstractDeflection, a basic functionality of wavefront manipulation is usually associated with the phase-gradient metasurfaces and the classical blazed gratings. We numerically and experimentally demonstrate an unusually wideband and simultaneously wide-angle deflection achieved at near-infrared in reflection mode for a periodic (nongradient), ultrathin meta-array comprising only one silicon nanorod (Mie resonator) per period. It occurs in the range where only the first negative diffraction order and zero order may propagate. Deflection serves as the enabler for multifunctional operation. Being designed with the main goal to obtain ultra-wideband and wide-angle deflection, the proposed meta-array is also capable in spatial filtering and wide-angle splitting. Spatial filtering of various types can be obtained in one structure by exploiting either deflection in nonzero diffraction orders, or the specular-reflection (zero-order) regime. Thus, the role of different diffraction orders is clarified. Moreover, on–off switching of deflection and related functionalities is possible by changing polarization state of the incident wave. The suggested device is simple to fabricate and only requires cost-effective materials, so it is particularly appropriate for the large-area fabrication using nanoprint lithography. Ultra-wideband wide-angle and other deflection scenarios, along with the other functionalities, are promising for applications in optical communications, laser optics, sensing, detection, and imaging.

scholarly journals Application of wide-field infrared reflectance imaging in retinoschisis, retinal detachments, and schisis detachments

2019 ◽  
Vol 5 (S1) ◽  
Author(s):  
Himanshu K. Banda ◽  
Anjali Shah ◽  
Gaurav K. Shah
Keyword(s):  
Retinal Detachment ◽  
Near Infrared ◽  
Infrared Imaging ◽  
Anterior Segment ◽  
Infrared Light ◽  
Main Body ◽  
Wide Field ◽  
Wide Angle ◽  
Infrared Reflectance ◽  
Non Invasive

Abstract Background Retinoschisis and retinal detachment are distinguished based on features in clinical examination. Even to skilled examiners, some cases may be diagnostic challenges. Infrared and wide-angle infrared reflectance imaging are relatively new modalities that can provide additional diagnostic information. Non-contact infrared reflectance imaging (also described as near-infrared imaging) highlights sub-retinal features which may otherwise be obscured by standard retinal photography. It is non-invasive and uses the retina’s ability to absorb, reflect or scatter infrared light to produce high quality images. Main body The aim of this review is to describe the role of wide-field infrared imaging in screening, diagnosing, and monitoring structural peripheral retinal disorders including retinoschisis, retinal detachment or combined retinoschisis rhegmatogenous detachments. Infrared imaging can also be used to monitor anterior segment inflammation. Heidelberg Wide-Field Module lens and Heidelberg Spectralis® HRA + OCT machine (Heidelberg Engineering, Heidelberg, Germany) were used to obtain noncontact, wide-field infrared images on each study eye. Pseudocolor photos were captured by Optos Optomap® (Optos, Inc, Massachusetts, USA). Conclusion Wide angle infrared imaging offers a quick, noncontact, and noninvasive way to help specialists accurately diagnose, monitor for progression, and educate patients about retinal detachment, retinoschisis and even anterior segment inflammation.

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