Free-Space Indium Tin Oxide Electro-Optic Transmission Modulator

IF 6.5 1区物理与天体物理 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

ACS Photonics Pub Date : 2024-12-26 DOI:10.1021/acsphotonics.4c01515

Martin Thomaschewski, Chaobo Dong, Yaliang Gui, Hao Wang, Hamed Dalir, Volker J. Sorger

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Abstract

Free-space electro-optic modulators provide control over the transverse transmission of an incident beam and are essential elements in metrology, sensing, and free-space communication. We present a novel modulator that leverages the free-carrier dispersion effect in indium tin oxide in combination with a plasmonic grating to achieve significant amplitude modulation with the potential to locally modify the optical signal at micrometer scales and high operation speeds. Subwavelength optical confinement and good spatial overlap of both grating resonance plasmonic modes and electrostatic fields created by the gold grating enable a notable modulation depth (∼0.5%) within a sub-10 nm active layer at the free-space wavelength of 1.55 μm. Due to the wide resonance formed by a plasmonic grating, broadband operation over 100 nm is demonstrated. Our monolithic indium tin oxide electro-optic platform enables a wide range of cost-effective light modulation applications that demand smaller footprints, faster operation, and higher robustness than in currently available state-of-the-art spatial light modulators.

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自由空间氧化铟锡电光传输调制器

自由空间电光调制器提供对入射光束横向传输的控制，是计量、传感和自由空间通信的基本要素。我们提出了一种新的调制器，利用氧化铟锡中的自由载流子色散效应与等离子体光栅相结合，实现了显著的幅度调制，具有在微米尺度和高运行速度下局部修改光信号的潜力。亚波长光约束以及由金光栅产生的光栅共振等离子体模式和静电场的良好空间重叠使得在自由空间波长为1.55 μm的亚10nm有源层内具有显著的调制深度（~ 0.5%）。由于等离子体光栅形成的宽共振，证明了100 nm以上的宽带工作。我们的单片氧化铟锡电光平台能够实现广泛的经济高效的光调制应用，这些应用需要比目前可用的最先进的空间光调制器更小的占地面积，更快的操作和更高的鲁棒性。

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来源期刊

ACS Photonics NANOSCIENCE & NANOTECHNOLOGY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

11.90

自引率

5.70%

发文量

438

审稿时长

2.3 months

期刊介绍： Published as soon as accepted and summarized in monthly issues, ACS Photonics will publish Research Articles, Letters, Perspectives, and Reviews, to encompass the full scope of published research in this field.