scholarly journals Influence of Nonlocality on Transmittance and Reflectance of Hyperbolic Metamaterials

Crystals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 577
Author(s):  
Bartosz Janaszek ◽  
Marcin Kieliszczyk ◽  
Anna Tyszka-Zawadzka ◽  
Paweł Szczepański
Keyword(s):  
Spatial Dispersion ◽  
Beam Steering ◽  
Spatial Filtering ◽  
Local Response ◽  
Hyperbolic Metamaterials ◽  
Total Reflectance ◽  
Resonant Character ◽  
Potential Applications ◽  
Working Principle ◽  
Optical Phenomena

In this paper we investigate transmittance and reflectance spectra of multilayer hyperbolic metamaterials in the presence of strong spatial dispersion. Our analysis revealed a number of intriguing optical phenomena, which cannot be predicted with the local response approximation, such as total reflectance for small angles of incidence or multiple transmittance peaks of resonant character (instead of the respective local counterparts, where almost complete transparency is predicted for small angles of incidence and the broad-angle transparency can be observed within a range of larger angles of incidence). We believe that the observed effects may serve as a working principle in a number of new potential applications, such as spatial filtering, biosensing, or beam steering.

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 Dielectric Elastomer Actuator for Soft Robotics Applications and Challenges

2020 ◽  
Vol 10 (2) ◽  
pp. 640 ◽  
Author(s):  
Jung-Hwan Youn ◽  
Seung Mo Jeong ◽  
Geonwoo Hwang ◽  
Hyunwoo Kim ◽  
Kyujin Hyeon ◽  
...  
Keyword(s):  
State Of The Art ◽  
Dielectric Elastomer ◽  
Artificial Muscles ◽  
Soft Robot ◽  
Optical Components ◽  
Dielectric Characteristics ◽  
Dielectric Elastomer Actuators ◽  
Potential Applications ◽  
Working Principle ◽  
Soft Actuators

This paper reviews state-of-the-art dielectric elastomer actuators (DEAs) and their future perspectives as soft actuators which have recently been considered as a key power generation component for soft robots. This paper begins with the introduction of the working principle of the dielectric elastomer actuators. Because the operation of DEA includes the physics of both mechanical viscoelastic properties and dielectric characteristics, we describe theoretical modeling methods for the DEA before introducing applications. In addition, the design of artificial muscles based on DEA is also introduced. This paper reviews four popular subjects for the application of DEA: soft robot hand, locomotion robots, wearable devices, and tunable optical components. Other potential applications and challenging issues are described in the conclusion.

Experimental study of optical hyperbolic metamaterials for high-efficiency spatial filtering

2020 ◽  
Vol 45 (17) ◽  
pp. 4923
Author(s):  
Na Yao ◽  
Jiao Jiao ◽  
Zhenfei Luo ◽  
Du Wang ◽  
Ke Cheng ◽  
...  
Keyword(s):  
Experimental Study ◽  
High Efficiency ◽  
Spatial Filtering ◽  
Hyperbolic Metamaterials

scholarly journals Explaining brightness illusions using spatial filtering and local response normalization

2007 ◽  
Vol 47 (12) ◽  
pp. 1631-1644 ◽  
Author(s):  
Alan E. Robinson ◽  
Paul S. Hammon ◽  
Virginia R. de Sa
Keyword(s):  
Spatial Filtering ◽  
Local Response

scholarly journals Beampattern analysis of frequency diverse array radar: a review

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Zeeshan Ahmad ◽  
Meng Chen ◽  
Shu-Di Bao
Keyword(s):  
Communication Systems ◽  
Essential Feature ◽  
Beam Steering ◽  
Frequency Offset ◽  
Wireless Communication Systems ◽  
Electronic Beam Steering ◽  
Potential Applications ◽  
Frequency Offsets ◽  
Frequency Diverse Array ◽  
Beampattern Synthesis

AbstractElectronic beam steering is an essential feature of state-of-the-art radar systems. Conventional phased array (PA) radars with fixed carrier frequencies are well-known for electronically steering their beam with high directivity. However, the resulting beampattern is angle-dependent but range-independent. Recently, a new electronic beam steering concept, referred to as frequency diverse array (FDA) radar, has attracted increasing attention due to its unique range-angle dependent beampattern. More importantly, the FDA radar employs a small frequency increment across the array elements to achieve beam steering as a function of angle, range, and time. In this paper, we review the development of the FDA radar since its inception in 2006. Since the frequency offset attaches great importance in FDAs to determine the beampattern shape, initially much of the research and development were focused on designing the optimal frequency offsets for improved beampattern synthesis. Specifically, we analyze characteristics of the FDA beampattern synthesis using various frequency offsets. In addition to analyzing the FDA beampattern characteristics, this study also focuses on the neglected propagation process of the transmitted signals in the early FDA literature, and discuss the time-variant perspective of FDA beampatterns. Furthermore, FDA can also play a significant role in wireless communications, owing to its potential advantages over the conventional PAs. Therefore, we highlight its potential applications in wireless communication systems. Numerical simulations are implemented to illustrate the FDA beampattern characteristics with various frequency offset functions.

scholarly journals Terahertz active spatial filtering through optically tunable hyperbolic metamaterials

2012 ◽  
Vol 37 (16) ◽  
pp. 3345 ◽  
Author(s):  
Carlo Rizza ◽  
Alessandro Ciattoni ◽  
Elisa Spinozzi ◽  
Lorenzo Columbo
Keyword(s):  
Spatial Filtering ◽  
Hyperbolic Metamaterials

scholarly journals Multi-Beam Steering for 6G Communications Based on Graphene Metasurfaces

Sensors ◽  
2021 ◽  
Vol 21 (14) ◽  
pp. 4784
Author(s):  
Huifang Ai ◽  
Qianlong Kang ◽  
Wei Wang ◽  
Kai Guo ◽  
Zhongyi Guo
Keyword(s):  
Communication Technology ◽  
Applied Voltage ◽  
High Performance ◽  
Beam Steering ◽  
Metal Substrate ◽  
Far Field ◽  
Great Demand ◽  
Field Distributions ◽  
Dielectric Spacer ◽  
Potential Applications

As communication technology is entering the 6G era, a great demand for high-performance devices operating in the terahertz (THz) band has emerged. As an important part of 6G technology, indoor communication requires multi-beam steering and tracking to serve multi-users. In this paper, we have designed a graphene metasurface that can realize multi-beam steering for directional radiations. The designed metasurface consists of graphene ribbons, dielectric spacer, and metal substrate. By designing the graphene ribbons and controlling the applied voltage on them, we have obtained single-, double-, and triple-beam steering. In addition, we have also numerically calculated the far-field distributions of the steered multi-beam with a diffraction distance of 2 m. Our design has potential applications in future indoor directional 6G communications.

Beam steering system and spatial filtering applied to interference lithography

2000 ◽  
Vol 18 (6) ◽  
pp. 3282 ◽  
Author(s):  
Paul T. Konkola ◽  
Carl G. Chen ◽  
Ralf K. Heilmann ◽  
Mark L. Schattenburg
Keyword(s):  
Beam Steering ◽  
Spatial Filtering ◽  
Steering System ◽  
Interference Lithography

THE APPLICATION PROSPECT OF MICROCANTILEVER SENSORS TECHNOLOGY ON MINERAL SURFACE ADSORPTION

2019 ◽  
Vol 26 (07) ◽  
pp. 1830010
Author(s):  
FEI FANG ◽  
FANFEI MIN ◽  
CHANGGUO XUE ◽  
JIA DU
Keyword(s):  
High Sensitivity ◽  
Fast Response ◽  
Detection Methods ◽  
Mineral Surfaces ◽  
Label Free ◽  
Microcantilever Sensors ◽  
Label Free Detection ◽  
Potential Applications ◽  
Working Principle ◽  
Interfacial Adsorption

The main purpose of this review is to present a new method to study the adsorption mechanism of reagents on mineral surfaces based on a microcantilever sensor system. The mechanisms of micro/nanoscale adsorption are of great significance in the interface sorting of minerals in the field of mineral processing. The sensing technique based on a microcantilever has become attractive with the advantages of label-free detection, high sensitivity, high-throughput, and fast response time. This review first discusses the structure, working principle, working modes, detection methods, and reported applications of microcantilever sensors. When combined with the working principle and applications, microcantilever sensors can monitor the adsorption process of reagents on mineral surfaces in real time. In the second part of this review, we will discuss the potential applications of microcantilever sensors in the interfacial adsorption of minerals.

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