Tunable elastomer-based virtually imaged phased array.
Tunable elastomer-based virtually imaged phased array.
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DOI：
10.1364/oe.21.003324
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发表时间：
2013-02
期刊：
影响因子：
3.8
通讯作者：
P. Metz;H. Block;Christopher Behnke;M. Krantz;M. Gerken;J. Adam
中科院分区：
文献类型：
--
作者：
P. Metz;H. Block;Christopher Behnke;M. Krantz;M. Gerken;J. Adam
与传统的光栅相比，虚拟成像相控阵(VIPA)具有很高的晶片级集成潜力和优异的光学性能。我们介绍了一种基于弹性体的可调VIPA，能够微调色散特性。它由一层聚二甲基硅氧烷(PDMS)层组成，夹在银底和顶层之间，分别形成VIPA的高反射和半透明反射镜。后者还用作焦耳加热的电极，从而通过热膨胀和热光效应的组合来实现光学PDMS谐振器的腔调谐。类似于自由光谱范围(FSR)，基于VIPA比色散定律，我们引入了一种新的特征VIPA性能度量，即自由角范围(FAR)。我们报告了通过170μm PDMS VIPA的7.2K温度升高而实现的远1的调谐范围。通过数值模拟和实验对谐振质量和可调谐性进行了分析。
Virtually imaged phased arrays (VIPAs) offer a high potential for wafer-level integration and superior optical properties compared to conventional gratings. We introduce an elastomer-based tunable VIPA enabling fine tuning of the dispersion characteristics. It consists of a poly-dimethylsiloxane (PDMS) layer sandwiched between silver bottom and top coatings, which form the VIPA's high reflective and semi-transparent mirror, respectively. The latter also acts as an electrode for Joule heating, such that the optical PDMS resonator cavity tuning is carried out via a combination of thermal expansion and the thermo-optic effect. Analogous to the free spectral range (FSR), based on a VIPA specific dispersion law, we introduce a new characteristic VIPA performance measure, namely the free angular range (FAR). We report a tuning span of one FAR achieved by a 7.2K temperature increase of a 170μm PDMS VIPA. Both resonance quality and tunability are analyzed in numerical simulations and experiments.