Broadband terahertz absorber realized by self assembled multilayer glass spheres

Dae-Seon Kim,¹ Dong-Hyun Kim,¹ Sehyun Hwang,² and Jae-Hyung Jang^1,2,3*

1School of Information and Communications, Gwangju Institute of Science and Technology, 1 Oryong-dong, Buk-gu, Gwangju 500-712, South Korea

2Research Institute for Solar and Sustainable Energies, Gwangju Institute of Science and Technology, 1 Oryongdong, Buk-gu, Gwangju 500-712, South Korea

3Department of Nanobio Materials and Electronics, Gwangju Institute of Science and Technology, 1 Oryong-dong, Buk-gu, Gwangju 500-712, South Korea

Optics Express, Vol. 20, Issue 12, pp. 13566-13572 (2012)
http://dx.doi.org/10.1364/OE.20.013566

Abstract

A broadband terahertz (THz) absorber consisting of multilayer glass spheres and polydimethylsiloxane (PDMS) was realized. The multilayer glass spheres were deposited by repeating a self-assembly method used to form monolayer glass spheres and by the spin-coating of PDMS to fill the gaps between the glass spheres. The average reflection at the surface of the absorber was 0.8% and the absorbance was higher than 98% in the frequency range between 0.7 to 2.0 THz.














.................................The reflectance and transmittance of the various types of devices were measured using a THz time domain spectroscopy system (TPS spectra 3000, TeraView) and their frequency domain responses were obtained by Fourier transform........................








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