Riahi Mohammadreza, Latifi Hamid, Madani Abbas, Moazzenzadeh Ali
Laser and Plasma Research Institute, Shahid Beheshti University, Evin, Tehran, Iran.
Appl Opt. 2009 Oct 20;48(30):5647-54. doi: 10.1364/AO.48.005647.
We propose the application of a thermally tunable grating as a spatial light modulator. The grooves of a square-well grating are filled with a liquid whose refractive index depends on temperature. The variation of optical characteristics of such a grating with respect to temperature is investigated theoretically and also by simulation and experiment. A thin-film heater is then used as a heat source. The relation between intensity of the first order of diffraction versus power consumption of the thin-film heater is investigated. Finally, a thin-film heater with a desired pattern is placed at the surface of the grating to fabricate spatial light modulator. By applying electrical current to different elements of the thin-film heater, the fabricated device can project a desired pattern on a screen using a 4f imaging system. The restrictions of such a device are discussed and another structure is proposed and discussed by numerical calculations to increase the ability of the device.
我们提出将热可调光栅用作空间光调制器。方阱光栅的凹槽填充有一种折射率取决于温度的液体。从理论上以及通过模拟和实验研究了这种光栅的光学特性随温度的变化。然后使用薄膜加热器作为热源。研究了一阶衍射强度与薄膜加热器功耗之间的关系。最后，将具有所需图案的薄膜加热器放置在光栅表面以制造空间光调制器。通过向薄膜加热器的不同元件施加电流，所制造的器件可以使用4f成像系统在屏幕上投射出所需图案。讨论了这种器件的局限性，并通过数值计算提出并讨论了另一种结构，以提高器件的性能。
