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Ultrabroadband Plasmonic Absorber for Terahertz Waves
Author(s) -
Cheng Yong Zhi,
Withayachumnankul Withawat,
Upadhyay Aditi,
Headland Daniel,
Nie Yan,
Gong Rong Zhou,
Bhaskaran Madhu,
Sriram Sharath,
Abbott Derek
Publication year - 2015
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201400368
Subject(s) - terahertz radiation , materials science , plasmon , optics , absorption (acoustics) , optoelectronics , broadband , absorbance , planar , terahertz gap , far infrared laser , terahertz metamaterials , physics , laser , computer graphics (images) , computer science , composite material
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.