Terahertz reflectarray as a polarizing beam splitter.
Tiaoming Niu,Withawat Withayachumnankul,Aditi Upadhyay,Philipp Gutruf,Derek Abbott,Madhu Bhaskaran,Sharath Sriram,Christophe Fumeaux +7 more
TLDR
The designed terahertz reflectarray can efficiently separate the two polarization components of a normally incident wave towards different predesigned directions of ±30° and the measured radiation patterns show excellent polarization purity, with a cross-polarization level below -27 dB.Abstract:
A reflectarray is designed and demonstrated experimentally for polarization-dependent beam splitting at 1 THz. This reflective component is composed of two sets of orthogonal strip dipoles arranged into interlaced triangular lattices over a ground plane. By varying the length and width of the dipoles a polarization-dependent localized phase change is achieved on reflection, allowing periodic subarrays with a desired progressive phase distribution. Both the simulated field distributions and the measurement results from a fabricated sample verify the validity of the proposed concept. The designed terahertz reflectarray can efficiently separate the two polarization components of a normally incident wave towards different predesigned directions of ±30°. Furthermore, the measured radiation patterns show excellent polarization purity, with a cross-polarization level below −27 dB. The designed reflectarray could be applied as a polarizing beam splitter for polarization-sensitive terahertz imaging or for emerging terahertz communications.read more
Citations
More filters
Journal ArticleDOI
Metasurfaces: From microwaves to visible
Stanislav Glybovski,Sergei A. Tretyakov,Pavel A. Belov,Yuri S. Kivshar,Yuri S. Kivshar,Constantin Simovski,Constantin Simovski +6 more
TL;DR: In this article, the basic physics and applications of planar metamaterials, often called metasurfaces, which are composed of optically thin and densely packed planar arrays of resonant or nearly resonant subwavelength elements, are reviewed.
Journal ArticleDOI
A review of gap-surface plasmon metasurfaces: fundamentals and applications
TL;DR: Gap-surface plasmon metamaterials have attracted increasing attention in recent years because of the ease of fabrication and unprecedented control over reflected or transmitted light while featuring relatively low losses even at optical wavelengths as mentioned in this paper.
Journal ArticleDOI
All-optical active THz metasurfaces for ultrafast polarization switching and dynamic beam splitting
TL;DR: An active hybrid metasurface integrated with patterned semiconductor inclusions for all-optical active control of terahertz waves is introduced and is expected to be useful for applications such as data-encoding and multiplexing in a terAhertz communications system as well as holography.
Journal ArticleDOI
Ultrabroadband reflective polarization convertor for terahertz waves
Yongzhi Cheng,Yongzhi Cheng,Withawat Withayachumnankul,Withawat Withayachumnankul,Aditi Upadhyay,Daniel Headland,Yan Nie,Rongzhou Gong,Madhu Bhaskaran,Sharath Sriram,Derek Abbott +10 more
TL;DR: In this paper, an ultrathin, ultrabroadband, and highly efficient reflective linear polarization convertor or half-wave retarder operating at terahertz frequencies was designed and experimentally demonstrated.
Journal ArticleDOI
Varactor-Tunable Second-Order Bandpass Frequency-Selective Surface With Embedded Bias Network
TL;DR: In this article, a varactor-tunable second-order bandpass frequency-selective surface (FSS) for microwave frequencies is presented, which is composed of three stacked metallic layers.
References
More filters
Journal ArticleDOI
Controlling Electromagnetic Fields
TL;DR: This work shows how electromagnetic fields can be redirected at will and proposes a design strategy that has relevance to exotic lens design and to the cloaking of objects from electromagnetic fields.
Journal ArticleDOI
Metamaterial Electromagnetic Cloak at Microwave Frequencies
David Schurig,Jack J. Mock,B.J. Justice,Steven A. Cummer,John B. Pendry,Anthony F. Starr,David R. Smith +6 more
TL;DR: This work describes here the first practical realization of a cloak of invisibility, constructed with the use of artificially structured metamaterials, designed for operation over a band of microwave frequencies.
Journal ArticleDOI
Light Propagation with Phase Discontinuities: Generalized Laws of Reflection and Refraction
Nanfang Yu,Patrice Genevet,Patrice Genevet,Mikhail A. Kats,Francesco Aieta,Francesco Aieta,Jean-Philippe Tetienne,Jean-Philippe Tetienne,Federico Capasso,Zeno Gaburro,Zeno Gaburro +10 more
TL;DR: In this article, a two-dimensional array of optical resonators with spatially varying phase response and subwavelength separation can imprint phase discontinuities on propagating light as it traverses the interface between two media.
Journal ArticleDOI
Terahertz Metamaterials for Linear Polarization Conversion and Anomalous Refraction
Nathaniel K. Grady,Jane E. Heyes,Dibakar Roy Chowdhury,Yong Zeng,Matthew T. Reiten,Abul Kalam Azad,Antoinette J. Taylor,Diego A. R. Dalvit,Hou-Tong Chen +8 more
TL;DR: In this paper, the authors demonstrated ultrathin, broadband, and highly efficient metamaterial-based terahertz polarization converters that are capable of rotating a linear polarization state into its orthogonal one.
Journal ArticleDOI
An optical cloak made of dielectrics
TL;DR: The optical 'carpet' cloak is designed using quasi-conformal mapping to conceal an object that is placed under a curved reflecting surface by imitating the reflection of a flat surface and enables broadband and low-loss invisibility at a wavelength range of 1,400-1,800 nm.