High performance spatial light Modulators for terahertz applications

被引：36

作者：

Hogue, Md Nadim Ferdous ^{[1
,2
]}

Karaoglan-Bebek, Gulten ^{[2
,3
]}

Holtz, Mark ^{[4
,5
]}

Bernussi, Ayrton A. ^{[1
,2
]}

Fan, Zhaoyang ^{[1
,2
]}

机构：

[1] Texas Tech Univ, Dept Elect & Comp Engn, Lubbock, TX 79409 USA

[2] Texas Tech Univ, Nano Tech Ctr, Lubbock, TX 79409 USA

[3] Texas Tech Univ, Dept Phys, Lubbock, TX 79409 USA

[4] Texas State Univ, Dept Phys, San Marcos, TX 78666 USA

[5] Texas State Univ, MSEC, San Marcos, TX 78666 USA

来源：

OPTICS COMMUNICATIONS | 2015年 / 350卷

关键词：

VO2; Metal-insulator transition; THz spatial light modulator; Modulator; PHASE-TRANSITION; METAMATERIAL; SPECTROSCOPY; WAVES;

D O I：

10.1016/j.optcom.2015.04.022

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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 x 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. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：309 / 314

页数：6

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