Design of All-Dielectric Long-wave infrared Wide-angle Metalens

2021 ◽  
Author(s):  
Ning Zhang ◽  
Qingzhi Li ◽  
Jun Chen ◽  
Feng Tang ◽  
Jingjun Wu ◽  
...  
Keyword(s):  
Focal Length ◽  
Low Cost ◽  
Numerical Aperture ◽  
Single Layer ◽  
Industrial Processing ◽  
Monochromatic Imaging ◽  
Long Wave ◽  
Wavelength Scale ◽  
Long Wave Infrared ◽  
Sub Wavelength

Abstract Optical metasurfaces are two-dimensional arrays of nano-scatterers that modify optical wavefronts at subwavelength spatial resolution. They achieve the effect of focusing through phase control under a sub-wavelength scale, named metalens. They are poised to revolutionize optics by enabling complex low-cost systems. However, there are monochromatic severe aberrations in the metasurfaces. In this paper,the long-wave infrared optical system coma is eliminated through a single-layer metasurface. By changing the phase function,this metalens have a numerical aperture of 0.89,a focal length of 150 μm,and a field of view of 120° (0.4@60lp/mm) that enables diffraction-limited monochromatic imaging along the focal plane at a wavelength of 10.6μm. And the designed metasurface maintains a favorable MTF value at different angles. This equipment can be widely used in imaging and industrial processing.

Earth Long-Wave Infrared Emission, New Ways to Harvest Energy

2015 ◽  
pp. 1-25
Author(s):  
Luciano Mescia ◽  
Pietro Bia ◽  
Onofrio Losito
Keyword(s):  
Low Cost ◽  
Dielectric Substrate ◽  
Infrared Emission ◽  
Long Wave ◽  
Challenges And Opportunities ◽  
Future Challenges ◽  
Recent Developments ◽  
Potential Applications ◽  
Long Wave Infrared ◽  
Thz Antennas

This chapter summarizes the physical properties of THz antennas, provides a summary of some of the most important recent developments in the field of energy harvesting of Earth long-wave infrared radiation, discusses the potential applications and identifies the future challenges and opportunities. In particular, a THz antenna is designed in order to transform the thermal energy, provided by the Sun and re-emitted from the Earth, in electricity. The proposed antenna is a square spiral of gold printed on a low cost dielectric substrate. Simulations have been conducted in order to investigate the behavior of the antenna illuminated by a circularly polarized plane wave with an amplitude chosen according to the Stefan-Boltzmann radiation law. Moreover, these THz antennas could be coupled with other components to obtain direct rectification of T radiation. As a consequence, these structures further optimized could be a promising alternative to the conventional photovoltaic solar cells.

Surface-Plasmons-Assisted Nanoscale Photolithography

2005 ◽  
Author(s):  
Dongbing Shao ◽  
Shaochen Chen
Keyword(s):  
Low Cost ◽  
Near Field ◽  
Optical Diffraction ◽  
Scanning Probe ◽  
Fabrication Technology ◽  
Scanning Probe Lithography ◽  
Low Contrast ◽  
The Past ◽  
Wavelength Scale ◽  
Sub Wavelength

Photolithography has remained a useful micro-fabrication technology because of its high throughput, low cost, simplicity, and reproducibility over the past several decades. However its resolution is limited at a sub-wavelength scale due to optical diffraction. Among all different approaches to overcoming this problem, such as electron-beam lithography, imprint lithography and scanning probe lithography, near-field optical lithography inherits many merits of the traditional photolithography method. Major drawbacks of this approach include low contrast, low transmission and low density.

Earth Long-Wave Infrared Emission, New Ways to Harvest Energy

2017 ◽  
pp. 1875-1899
Author(s):  
Luciano Mescia ◽  
Pietro Bia ◽  
Onofrio Losito
Keyword(s):  
Low Cost ◽  
Dielectric Substrate ◽  
Infrared Emission ◽  
Long Wave ◽  
Challenges And Opportunities ◽  
Future Challenges ◽  
Recent Developments ◽  
Potential Applications ◽  
Long Wave Infrared ◽  
Thz Antennas

This chapter summarizes the physical properties of THz antennas, provides a summary of some of the most important recent developments in the field of energy harvesting of Earth long-wave infrared radiation, discusses the potential applications and identifies the future challenges and opportunities. In particular, a THz antenna is designed in order to transform the thermal energy, provided by the Sun and re-emitted from the Earth, in electricity. The proposed antenna is a square spiral of gold printed on a low cost dielectric substrate. Simulations have been conducted in order to investigate the behavior of the antenna illuminated by a circularly polarized plane wave with an amplitude chosen according to the Stefan-Boltzmann radiation law. Moreover, these THz antennas could be coupled with other components to obtain direct rectification of T radiation. As a consequence, these structures further optimized could be a promising alternative to the conventional photovoltaic solar cells.

Smooth TiO2 Thin Films Grown by Aqueous Spray Deposition for Long-Wave Infrared Applications

MRS Advances ◽  
2018 ◽  
Vol 3 (5) ◽  
pp. 255-260 ◽  
Author(s):  
Sarmad Fawzi Hamza Alhasan ◽  
Seth R. Calhoun ◽  
Hussain Abouelkhair ◽  
Vanessa C. Lowry ◽  
Robert E. Peale ◽  
...  
Keyword(s):  
Spray Deposition ◽  
Low Cost ◽  
Large Area ◽  
Tio2 Thin Films ◽  
Long Wave ◽  
Nano Crystalline ◽  
Metal Insulator Metal ◽  
Pressure Chemical ◽  
Indirect Band Gap ◽  
Long Wave Infrared

ABSTRACTSelf-assembled TiO2 films deposited by aqueous-spray deposition were investigated to evaluate morphology, crystalline phase, and infrared optical constants. The Anatase nano-crystalline film had ∼10 nm characteristic surface roughness sparsely punctuated by defects of not more than 200 nm amplitude. The film is highly transparent throughout the visible to wavelengths of 12 μm. The indirect band gap was determined to be 3.2 eV. Important for long-wave infrared applications is that dispersion in this region is weak compared with the more commonly used dielectric SiO2 for planar structures. An example application to a metal-insulator-metal resonant absorber is presented. The low-cost, large-area, atmospheric-pressure, chemical spray deposition method allows conformal fabrication on flexible substrates for long-wave infrared photonics.

Broadband, large-numerical-aperture and high-efficiency microwave metalens by using a double-layer transmissive metasurface

2021 ◽  
Author(s):  
Yong-Qiang Liu ◽  
Zhongru Ren ◽  
Yingchao Shu ◽  
Lujun Wu ◽  
Jinhai Sun ◽  
...  
Keyword(s):  
High Efficiency ◽  
Low Cost ◽  
Numerical Aperture ◽  
Modern Science ◽  
Frequency Range ◽  
Phase Gradient ◽  
Low Profile ◽  
Microwave Components ◽  
Measurement Results ◽  
Sub Wavelength

Abstract Broadband metalenses consist of sub-wavelength phase gradient elements are indispensable in modern science and technology. So far, several broadband optical metalenses are demonstrated but mostly with either small NA or relatively low focusing efficiency. Herein, an ultra-thin broadband microwave metalens (frequency range from 8.0GHz to 10.5GHz) with both high-efficiency above 40% and large NA more than 0.6 is presented. The metalens is also fabricated and the measurement results agree with the simulations very well. The performances of the presented broadband metalens can surpass nowadays microwave metalens largely and open up new vistas for low-profile, low-cost and light-weight microwave components.

scholarly journals On the possibility of using thermal vision cameras for observations of meteors and other atmospheric formations in long wave infrared

2019 ◽  
pp. 33-38
Author(s):  
P. Kozak ◽  
L. Kozak
Keyword(s):  
Near Infrared ◽  
Low Cost ◽  
Ultra Violet ◽  
Short Wave ◽  
Infrared Observations ◽  
Long Wave ◽  
Thermal Vision ◽  
And Inversion ◽  
The Given ◽  
Long Wave Infrared

The characteristics of the modern low-cost thermal vision cameras for possible observations of meteors and other atmospheric formations in long wave infrared spectrum range of 8-14 μm are investigated. An overview of meteor observations in non-traditional spectrum ranges: ultra-violet, near infrared, short wave, mid wave, and long wave infrared is done. A short description of the modern instruments for infrared observations is presented. By the example of a modern inexpensive model of thermal vision camera of the lower price segment there are presented results of test observations of clouds, possible atmospheric bolide tails and inversion t tracks of airplanes, meteors, and thunderstorm discharges. A short analysis of technical characteristics of the selected model, and corresponding software is given, the merits and demerits of the given type of observational instruments are analyzed as well. The conclusion for outlook of using in the future the thermal vision cameras in meteor astronomy and geophysics is done.

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