Abstract-Terahertz filter integrated with a subwavelength structured antireflection coating

Jeong Min Woo¹, Dae-Seon Kim¹, Dong-Ju Kim¹ and Jae-Hyung Jang^1,a)
http://scitation.aip.org/content/aip/journal/adva/5/12/10.1063/1.4939571
a) Electronic mail: jjang@gist.ac.kr.
AIP Advances 5, 127238 (2015); http://dx.doi.org/10.1063/1.4939571

Micro-pyramid shaped subwavelength structures (SWSs) were integrated on both sides of a terahertz (THz) filter by means of stamping methods. Two silicon-based stamping molds fabricated via crystallographic wet etching were utilized to replicate SWSs onto cyclo-olefin copolymer (COC) films coated onto both sides of a THz filter at the same time. The SWSs act as an broadband antireflection coating to reduce the surfacereflection loss in a frequency range of 0.2 THz to 1.4 THz. Compared to a THz filter without SWSs, the filter integrated with double-sided SWSs exhibits a low standing wave ratio inside the substrate and THz signal transmission enhancement of up to 10.8%.

Abstract-Dual-band terahertz metamaterials based on nested split ring resonators

http://apl.aip.org/resource/1/applab/v101/i9/p091103_s1?isAuthorized=no

Sajid Hussain¹, Jeong Min Woo², and Jae-Hyung Jang^1,2

¹Department of WCU Nanobio Materials and Electronics, Gwangju Institute of Science and Technology, 1 Oryong Dong, Buk-gu, Gwangju 500-712, South Korea
²Department of Information and Communications, Gwangju Institute of Science and Technology, 1 Oryong Dong, Buk-gu, Gwangju 500-712, South Korea 

Two dual-band terahertz metamaterials based on nested split ring resonators (SRRs) were designed and fabricated on a flexible plastic substrate. Each nested SRR structure composed of two electric field coupled resonators exhibited two transmission minimums, which inherently come from the LC resonances of the respective SRRs. The primary and secondary resonance frequencies can be individually fine-tuned by adjusting the geometry of the respective resonator. The fabricated devices exhibited very low insertion loss of 3 dB in the transmission band and the high attenuation of 27 dB in the stop band.

© 2012 American Institute of Physics