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Type: Journal article
Title: Ultrabroadband plasmonic absorber for terahertz waves
Author: Cheng, Y.
Withayachumnankul, W.
Upadhyay, A.
Headland, D.
Nie, Y.
Gong, R.
Bhaskaran, M.
Sriram, S.
Abbott, D.
Citation: Advanced Optical Materials, 2015; 3(3):376-380
Publisher: Wiley
Issue Date: 2015
ISSN: 2195-1071
Statement of
Cheng, Yong Zhi, Withayachumnankul, Withawat, Upadhyay, Aditi, Headland, Daniel, Nie, Yan, Gong, Rong Zhou, Bhaskaran, Madhu, Sriram, Sharath, Abbott, Derek
Abstract: Perfect absorbers that exhibit broadband absorption of terahertz radiation are promising for applications in imaging and detection due to enhanced contrast and sensitivity in this relatively untapped frequency regime. Here, terahertz plasmonics is used to demonstrate near-unity absorption across a broad spectral range. The absorber comprises a planar array of cross-shaped structures defined by surface etching of doped silicon. Absorbance of over 90% is observed numerically with a relative bandwidth of 90% from 0.67 to 1.78 THz, in reasonable agreement with experimental observation. This ultrabroadband absorption is attributed to two resonance modes supported by plasmonic cavities that are defined by the etched cross structure. This terahertz absorber is single-layered, polarization-insensitive, and exhibits consistent performance across a wide range of incidence angles. The plasmonic-based approach for enhancing absorption is a potential precursor to the realization of efficient bolometric imaging and communications at terahertz frequencies.
Rights: © 2014 Wiley-VCH Verlag GmbH & Co. KG₂A, Weinheim
RMID: 0030025630
DOI: 10.1002/adom.201400368
Grant ID:
Appears in Collections:Electrical and Electronic Engineering publications

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