High performance spatial light modulators for terahertz applications

Md Nadim Ferdous Hoque, Gulten Karaoglan-Bebek, Mark Holtz, Ayrton A. Bernussi, Zhaoyang Fan

Research output: Contribution to journalArticle

23 Scopus citations

Abstract

We demonstrate large-contrast, low-crosstalk, low-power, and broadband spatial light modulators (SLMs) for operation at terahertz (THz) frequencies. The electro-thermally activated SLMs rely on the insulator-metal-phase transition of two VO2 thin films deposited on opposite sides of a sapphire substrate. We validated the effectiveness of our approach by fabricating and testing 2×2 pixel SLM prototypes. Record high amplitude modulation depth of 96%, -30 dB pixel-to-pixel crosstalk and precise THz transmission control was determined for the fabricated SLMs over a broad range of THz frequencies. Raster scanning THz transmission revealed excellent pixel uniformity with very large on/off contrast. These attributes are fundamental for high-contrast THz imaging and spectroscopy applications.

Original languageEnglish
Pages (from-to)309-314
Number of pages6
JournalOptics Communications
Volume350
DOIs
StatePublished - Sep 1 2015

Keywords

  • Metal-insulator transition
  • Modulator
  • THz spatial light modulator
  • VO<inf>2</inf>

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