Thermally tunable optical aperture based on a segmented thin-film resonator
Thermally tunable optical aperture based on a segmented thin-film resonator
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DOI：
10.1117/12.2052135
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发表时间：
2014-05
期刊：
影响因子：
--
通讯作者：
H. Block;P. Metz;J. Adam;M. Gerken
中科院分区：
文献类型：
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作者：
H. Block;P. Metz;J. Adam;M. Gerken
光学元件是许多光学系统中的基本元件。由于光学系统不断被小型化和集成化，因此需要小而便宜的孔径来控制光束形状和光强度。目前用于微米制度的孔径概念依赖于移动MEMS薄片或通过毛细管力或静电力控制流体。我们展示了基于分段薄膜谐振器的热调谐的单波长操作的孔径概念。热调谐改变弹性体腔的光学厚度。这允许将强度调节到特定孔径段中的相长干涉和相消干涉之间的任何水平。为了演示孔径操作，我们模拟热，机械和光学性能，采用有限元法和传输矩阵法。我们确认我们的模拟结果，通过实验光束形状测量和空间分辨光谱传输和光强度测量。
Apertures are basic elements which can be found in many optical systems. Since optical systems are continuously being miniaturized and integrated, there is a need for small and inexpensive apertures to control beam shape and light intensity. Current aperture concepts for the micrometer regime rely on moving MEMS lamella or controlling fluids by capillary or electrostatic forces. We demonstrate an aperture concept for single-wavelength operation based on thermal tuning of a segmented thin film resonator. Thermal tuning changes the optical thickness of the elastomer cavity. This allows for adjusting the intensity to any level between constructive and destructive interference in a specific aperture segment. In order to demonstrate aperture operation we simulate thermal, mechanical and optical properties using finite element method and transfer-matrix method. We confirm our simulation results by experimental beam shape measurements and spatially-resolved spectral transmission and light intensity measurements.