Continuous tuning of W-doped VO2 optical properties for terahertz analog applications

G. Karaoglan-Bebek, M. N.F. Hoque, M. Holtz, Z. Fan, A. A. Bernussi

Research output: Contribution to journalArticle

36 Scopus citations

Abstract

Vanadium dioxide (VO2), with its characteristic metal-insulator phase transition, is a prospective active candidate to realize tunable optical devices operating at terahertz (THz) frequencies. However, the abrupt phase transition restricts its practical use in analog-like continuous applications. Incorporation of tungsten is a feasible approach to alter the phase transition properties of thin VO2 films. We show that amplitude THz modulation depth of ∼65%, characteristic phase transition temperature of ∼40°C, and tuning range larger than 35°C can be achieved with W-doped VO2 films grown on sapphire substrates. W-doped VO2 films can also be used to suppress Fabry-Perot resonances at THz frequencies but at temperatures much lower than that observed for undoped VO2 films. The gradual phase transition temperature window allows for precise control of the W-doped VO2 optical properties for future analog based THz devices.

Original languageEnglish
Article number201902
JournalApplied Physics Letters
Volume105
Issue number20
DOIs
StatePublished - Nov 17 2014

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