Metamaterial-based octave-wide terahertz bandpass filters

作     者：ALI MALEKI AVINASH SINGH AHMED JABER WEI CUI YONGBAO XIN BRIAN T.SULLIVAN ROBERT W.BOYD JEAN-MICHEL MÉNARD 

作者机构：Department of PhysicsUniversity of OttawaOttawaOntario K1N 6N5Canada Iridian Spectral Technologies LtdOttawaOntario K1G 6R8Canada School of Electrical Engineering and Computer ScienceUniversity of OttawaOttawaOntario K1N 6N5Canada Institute of Optics and Department of Physics and AstronomyUniversity of RochesterRochesterNew York 14627USA 

出 版 物：《Photonics Research》 (光子学研究（英文版）)

年 卷 期：2023年第11卷第4期

页      面：526-532页

核心收录：

学科分类：0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 080902[工学-电路与系统] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：Natural Sciences and Engineering Research Council of Canada(RGPIN-2016-04797,STPGP/521619-2018) Canada Foundation for Innovation(35269) 

主　　题：process. field. approaching 

摘      要：We present octave-wide bandpass filters in the terahertz(THz)region based on bilayer-metamaterial(BLMM)*** passband region has a super-Gaussian shape with a maximum transmittance approaching 70%and a typical stopband rejection of 20 *** design is based on a metasurface consisting of a metallic squarehole array deposited on a transparent polymer,which is stacked on top of an identical metasurface with a subwavelength *** superimposed metasurface structures were designed using finite-difference time-domain(FDTD)simulations and fabricated using a photolithography *** characterization of these structures between 0.3 and 5.8 THz is performed with a time-domain THz spectroscopy *** agreement between experiment and simulation results is *** also demonstrated that two superimposed BLMM(2BLMM)devices increase the steepness of the roll-offs to more than 85 dB/octave and enable a superior stopband rejection approaching 40 dB while the maximum transmittance remains above 65%.This work paves the way toward new THz applications,including the detection of THz pulses centered at specific frequencies,and an enhanced time-resolved detection sensitivity toward molecular vibrations that are noise dominated by a strong,off-resonant,driving field.