High performance spatial light modulators for terahertz applications

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

doi:10.1016/j.optcom.2015.04.022

High performance spatial light modulators for terahertz applications

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

Electrical and Computer Engineering

Research output: Contribution to journal › Article

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 language	English
Pages (from-to)	309-314
Number of pages	6
Journal	Optics Communications
Volume	350
DOIs	https://doi.org/10.1016/j.optcom.2015.04.022
State	Published - Sep 1 2015

Keywords

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

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10.1016/j.optcom.2015.04.022

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Ferdous Hoque, M. N., Karaoglan-Bebek, G., Holtz, M., Bernussi, A. A., & Fan, Z. (2015). High performance spatial light modulators for terahertz applications. Optics Communications, 350, 309-314. https://doi.org/10.1016/j.optcom.2015.04.022

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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.",

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AU - Ferdous Hoque, Md Nadim

AU - Karaoglan-Bebek, Gulten

AU - Holtz, Mark

AU - Bernussi, Ayrton A.

AU - Fan, Zhaoyang

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