scholarly journals Chiral-selective Plasmonic Metasurface Absorber Based on Bilayer Fourfold Twisted Semicircle Nanostructure at Optical Frequency

2020 ◽  
Author(s):  
Yongzhi Cheng ◽  
Fu Chen ◽  
Hui Luo
Keyword(s):  
Electric Fields ◽  
Optical Communications ◽  
Optical Filters ◽  
Dielectric Substrate ◽  
Optical Frequency ◽  
Selective Absorption ◽  
Absorption Bands ◽  
Left Handed ◽  
Resonance Frequencies ◽  
Potential Applications

Abstract In this paper, we demonstrate theoretically a plasmonic metasurface absorber (PMSA) for the high chiral-selective absorption for right-handed and left-handed circular polarization (RCP and LCP) lights at optical frequency. The PMSA is composed of a dielectric substrate sandwiched with bi-layer fourfold twisted semicircle nanostructure. Numerical simulation results that the proposed PMSA has a strong chiral selective absorption bands, where absorption peaks for LCP and RCP lights occur at different resonance frequencies resulting in significant circular dichroism (CD) effect. It is shown that the maximum absorbance of the PMSA can reach to 93.2% for LCP light and 91.6% for RCP light, and that the maximum CD magnitude is about 0.85 and 0.91 around 288.5 THz and 404 THz, respectively. The mechanism of the strong chiroptical response of the PMSA is illustrated and revealed by electric fields distributions. Furthermore, the influence of the geometry of the proposed PMSA on the chiral-selective absorption characterization is studied systematically. Due to the strong chiral-selective absorption and CD effect, the proposed PMSA can be found many potential applications in some areas, such as chiral imaging, optical filters, detecting, and optical communications.PACS numbers: 42.25.Bs, 78.20.−e

scholarly journals Plasmonic Chiral Metasurface Absorber Based on Bilayer Fourfold Twisted Semicircle Nanostructure at Optical Frequency

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Yongzhi Cheng ◽  
Fu Chen ◽  
Hui Luo
Keyword(s):  
Absorption Band ◽  
Circular Polarization ◽  
Electric Fields ◽  
Dielectric Substrate ◽  
Unit Cell ◽  
Optical Frequency ◽  
Selective Absorption ◽  
Left Handed ◽  
Resonance Frequencies ◽  
Metal Nanostructure

AbstractIn this paper, we present a plasmonic chiral metasurface absorber (CMSA), which can achieve high selective absorption for right-handed and left-handed circular polarization (RCP, “+”, and LCP, “−”) lights at optical frequency. The CMSA is composed of a dielectric substrate sandwiched with bi-layer fourfold twisted semicircle metal nanostructure. The proposed CMSA has a strong selective absorption band, where absorption peaks for LCP and RCP lights occur at different resonance frequencies, reflecting the existence of a significant circular dichroism (CD) effect. It is shown that the absorbance of the CMSA can reach to 93.2% for LCP light and 91.6% for RCP light, and the maximum CD magnitude is up to 0.85 and 0.91 around 288.5 THz and 404 THz, respectively. The mechanism of the strong chiroptical response of the CMSA is illustrated by electric fields distributions of the unit-cell nanostructure. Furthermore, the influence of the geometry of the proposed CMSA on the circular polarization selective absorption characterization is studied systematically.

scholarly journals Plasmonic chiral metasurface absorber based on bilayer fourfold twisted semicircle nanostructure at optical frequency

2020 ◽  
Author(s):  
Yongzhi Cheng ◽  
Fu Chen ◽  
Hui Luo
Keyword(s):  
Absorption Band ◽  
Circular Polarization ◽  
Electric Fields ◽  
Dielectric Substrate ◽  
Unit Cell ◽  
Optical Frequency ◽  
Selective Absorption ◽  
Left Handed ◽  
Resonance Frequencies ◽  
Metal Nanostructure

Abstract In this paper, we present a plasmonic chiral metasurface absorber (CMSA), which can achieve the high selective absorption for right-handed and left-handed circular polarization (RCP, “+”, and LCP, “-”) lights at optical frequency. The CMSA is composed of a dielectric substrate sandwiched with bi-layer fourfold twisted semicircle metal nanostructure. The proposed CMSA has a strong selective absorption band, where absorption peaks for LCP and RCP lights occur at different resonance frequencies, reflecting the existence of a significant circular dichroism (CD) effect. It is shown that the absorbance of the CMSA can reach to 93.2% for LCP light and 91.6% for RCP light, and that the maximum CD magnitude is up to 0.85 and 0.91 around 288.5 THz and 404 THz, respectively. The mechanism of the strong chiroptical response of the CMSA is illustrated by electric fields distributions of the unit-cell nanostructure. Furthermore, the influence of the geometry of the proposed CMSA on the circular polarization selective absorption characterization is studied systematically.

A DoD Perspective on Left Handed Negative Index Materials and Potential Applications

2006 ◽  
Vol 919 ◽  
Author(s):  
Valerie Browning ◽  
Minas H Tanielian ◽  
Richard W. Ziolkowski ◽  
Nader Engheta ◽  
David R. Smith
Keyword(s):  
Composite Structures ◽  
Beam Steering ◽  
Electromagnetic Response ◽  
Electromagnetic Spectrum ◽  
Negative Index ◽  
Negative Index Materials ◽  
Left Handed ◽  
Potential Applications ◽  
Novel Approaches ◽  
Electromagnetic Transport

AbstractIn the quest for ever smaller, lighter weight, and conformal components and devices for radar and communication applications, researchers in the RF community have increasingly turned to artificially engineered, composite structures (or “metamaterials”) in order to exploit the extraordinary electromagnetic response these materials offer. One particularly promising class of metamaterials that has recently received a great deal of attention are “left-handed” or negative index materials. Because these metamaterials exhibit the unique ability to bend and focus light in ways no other conventional materials can, they hold great potential for enabling a number of innovative lens and antenna structures for a broad range of commercial and DoD relevant applications. Exploring the possible implementation of negative index materials for such applications will require significant enhancements in the properties of existing Negative Index Materials (NIM) (bandwidth, loss, operational frequency, etc.), as well as improved understanding of the physics of their electromagnetic transport properties. For this reason the Defense Advanced Research Project Agency (DARPA) has initiated a program that seeks to further develop and demonstrate NIM for future DoD missions including, but not limited to, the following: 1) lightweight, compact lenses with improved optics; 2) sub wavelength/high resolution imaging across the electromagnetic spectrum; 3) novel approaches to beam steering for radar, RF, and/or optical communications; and 4) novel approaches for integrating optics with semiconductor electronics. A brief overview of the salient properties of NIM will be presented as well as a general discussion of a few of their potential applications.

scholarly journals A III B VI PHOTOVOLTAIC RECEPTORS FOR EXPERIMENTAL DETERMINATION OF CARBON COMPOUNDS IN ATMOSPHERE

2016 ◽  
Vol 19 (3) ◽  
Author(s):  
IULIANA CARAMAN ◽  
IGOR EVTODIEV ◽  
OXANA RACOVEŢ ◽  
MARIUS STAMATE
Keyword(s):  
Electric Fields ◽  
Full Range ◽  
Absorption Bands ◽  
Gaseous State ◽  
Wide Range ◽  
Carbon Compounds ◽  
Strong Electric Fields ◽  
Qualitative Measurements ◽  
Semiconductor Type

<p><span lang="EN-US">This paper examines the prospects of using semiconductor layered A<span class="apple-converted-space"> </span><sup>III</sup><span class="apple-converted-space"> </span>B<span class="apple-converted-space"> </span><sup>VI</sup><span class="apple-converted-space"> type -</span> photovoltaic cells<span class="apple-converted-space"> </span>and the photoresis<span class="apple-converted-space">tors</span> as receptors<span class="apple-converted-space"> </span>for quantitative and qualitative measurements of carbon oxides. Carbon compounds in gaseous state form absorption bands of<span class="apple-converted-space"> </span>electromagnetic<span class="apple-converted-space"> </span>radiation in a wide range of spectrum (200 ÷ 100 000) cm<sup>-1</sup>.<span class="apple-converted-space"> </span>The light absorbed<span class="apple-converted-space"> </span>or emitted<span class="apple-converted-space"> </span>in these bands <span class="apple-converted-space">at the</span> excitations with ionizing radiation (X, γ) or strong electric fields contain direct information about the<span class="apple-converted-space"> </span>concentration of these molecules.  The frequencies that<span class="apple-converted-space"> </span>correspond to maxima of these bands are characteristic parameters of absorbing molecules. Fundamental absorption bands of CO, CO<span class="apple-converted-space"> </span><sub>2</sub> and NC have the edge of band at the border of ultraviolet-vacuum, while the emission bands <em>d</em> cover their full range of wave numbers from 45000 cm<sup>-1 </sup>to 10000 cm<sup>-1</sup>. Two types of radiation receptors from lamellar semiconductor type A<sup>III</sup>B<sup>VI</sup><span class="apple-converted-space"> </span>photosensitive in this spectral range are studied.</span></p>

MoS2-wrapped microfiber-based multi-wavelength soliton fiber laser

2017 ◽  
Vol 31 (32) ◽  
pp. 1750303 ◽  
Author(s):  
Feifei Lu
Keyword(s):  
Pump Power ◽  
Fiber Laser ◽  
Saturable Absorber ◽  
Optical Communications ◽  
Fiber Lasers ◽  
Tunable Filter ◽  
Linear Birefringence ◽  
Erbium Doped ◽  
Potential Applications ◽  
Multi Wavelength

The single-, dual- and triple-wavelength passively mode-locked erbium-doped fiber lasers are demonstrated with MoS2 and polarization-dependent isolator (PD-ISO). The saturable absorber is fabricated by wrapping an MoS2 around a microfiber. The intracavity PD-ISO acts as a wavelength-tunable filter with a polarization controller (PC) by adjusting the linear birefringence. Single-wavelength mode-locked fiber laser can self-start with suitable pump power. With appropriate PC state, dual- and triple-wavelength operations can be observed when gains at different wavelengths reach a balance. It is noteworthy that dual-wavelength pulses exhibiting peak and dip sidebands, respectively, are demonstrated in the experiment. The proposed simple and multi-wavelength all-fiber conventional soliton lasers could possess potential applications in numerous fields, such as sensors, THz generations and optical communications.

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.

scholarly journals Lattice Rayleigh Anomaly Associated Enhancement of NH and CH Stretching Modes on Gold Metasurfaces for Overtone Detection

Nanomaterials ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1265 ◽  
Author(s):  
Daler R. Dadadzhanov ◽  
Tigran A. Vartanyan ◽  
Alina Karabchevsky
Keyword(s):  
Near Infrared ◽  
Field Enhancement ◽  
Dielectric Substrate ◽  
Square Lattice ◽  
Localized Surface Plasmon ◽  
Absorption Enhancement ◽  
Absorption Bands ◽  
Transparent Dielectric ◽  
Infrared Spectral ◽  
Rayleigh Anomaly

Molecular overtones stretching modes that occupy the near-infrared (NIR) are weak compared to the fundamental vibrations. Here we report on the enhancement of absorption by molecular vibrations overtones via electromagnetic field enhancement of plasmonic nanoparallelepipeds comprising a square lattice. We explore numerically, using finite element method (FEM), gold metasurfaces on a transparent dielectric substrate covered by weakly absorbing analyte supporting N-H and C-H overtone absorption bands around 1.5 μ m and around 1.67 μ m, respectively. We found that the absorption enhancement in N-H overtone transition can be increased up to the factor of 22.5 due to the combination of localized surface plasmon resonance in prolonged nanoparticles and lattice Rayleigh anomaly. Our approach may be extended for sensitive identification of other functional group overtone transitions in the near-infrared spectral range.

scholarly journals Discrimination Between Explosive Materials and Isomers Using a Human Color Vision-Inspired Sensing Method

2019 ◽  
Vol 73 (5) ◽  
pp. 520-528 ◽  
Author(s):  
Kevin J. Major ◽  
Thomas C. Hutchens ◽  
Christopher R. Wilson ◽  
Menelaos K. Poutous ◽  
Ishwar D. Aggarwal ◽  
...  
Keyword(s):  
Color Vision ◽  
Optical Filters ◽  
High Confidence ◽  
Absorption Bands ◽  
Vision Sensing ◽  
Explosive Materials ◽  
Human Color Vision ◽  
Ft Ir ◽  
Aluminum Substrates ◽  
Ft Ir Spectroscopy

This paper describes the application of a human color vision approach to infrared (IR) chemical sensing for the discrimination between multiple explosive materials deposited on aluminum substrates. This methodology classifies chemicals using the unique response of the chemical vibrational absorption bands to three broadband overlapping IR optical filters. For this effort, Fourier transform infrared (FT-IR) spectroscopy is first used to computationally examine the ability of the human color vision sensing approach to discriminate between three similar explosive materials, 1,3,5,-Trinitro-1,3,5-triazinane (RDX), 2,2-Bis[(nitrooxy)methyl]propane-1,3,-diyldinitrate (PETN), and 1,3,5,7-Tetranitro-1,3,5,7-tetrazocane (HMX). A description of a laboratory breadboard optical sensor designed for this approach is then provided, along with the discrimination results collected for these samples using this sensor. The results of these studies demonstrate that the human color vision approach is capable of high-confidence discrimination of the examined explosive materials.

scholarly journals Analysis and design of a triple band metamaterial simplified CRLH cells loaded monopole antenna

2016 ◽  
Vol 9 (4) ◽  
pp. 903-913 ◽  
Author(s):  
Mahmoud Abdelrahman Abdalla ◽  
Zhirun Hu ◽  
Cahyo Muvianto
Keyword(s):  
Simple Structure ◽  
Monopole Antenna ◽  
Proof Of Concept ◽  
Analysis And Design ◽  
Design Procedures ◽  
Left Handed ◽  
Full Wave ◽  
Compact Size ◽  
Resonance Frequencies ◽  
Triple Band

The design and analysis of meta-material inspired loaded monopole antenna for multiband operation are reported. The proposed antenna consists of multi resonators inspired from half mode composite right/left handed cells, which has a simple structure, compact size, and provides multiband functionalities. As a proof of concept, a triple band antenna covering all possible WiMAX operating bands, has been designed, fabricated, and characterized. The hosting monopole patch itself generates resonance for 3.3–3.8 GHz band, whereas the loaded metamaterial cells add extra resonance frequencies. The loading of two resonator cells introduces two extra resonances for 2.5–2.7 GHz and 5.3–5.9 GHz bands, respectively. The antenna's operating principle and design procedures with the aid of electromagnetic full wave simulation and experimental measurements are presented. The antenna has good omnidirectional patterns at all three bands. The monopole patch size is 13.5 × 6.5 mm2and the whole antenna size (including the feed line) is 35 × 32 mm2. Compared with conventional single band microstrip patch radiator, the radiator size of this antenna is only 8.5% at 2.5 GHz, 17% at 3.5 GHz, and 37% at 5.5 GHz.

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