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Hybrid metasurface for ultra-broadband terahertz modulation

Heyes, Jane; Withayachumnankul, Withawat; Grady, Nathaniel; Roy Chowdhury, Dibakar; Azad, Abul; Chen, Hou-Tong


We demonstrate an ultra-broadband free-space terahertz modulator based on a semiconductorintegrated metasurface. The modulator is made of a planar array of metal cut-wires on a silicon-onsapphire substrate, where the silicon layer functions as photoconductive switches. Without external excitation, the cut-wire array exhibits a Lorentzian resonant response with a transmission passband spanning dc up to the fundamental dipole resonance above 2 THz. Under photoexcitation with 1.55 eV...[Show more]

CollectionsANU Research Publications
Date published: 2014
Type: Journal article
Source: Applied Physics Letters
DOI: 10.1063/1.4901050


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