15 May 2012 850nm VCSEL with a liquid crystal overlay
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We developed an in- house technology to overlay liquid crystal (LC) on top of a 850nm Vertical Cavity Surface Emitting Laser (VCSEL) creating a so-called LC-VCSEL. Prior to this, the effect of the cell thickness on the planar alignment of the E7 LC is investigated. It is observed that the LC orientation is planar, uniformly aligned over the whole cell with an average pre-tilt of 22.50 in a thin a cell of 13μm thickness; such alignment uniformity is not observed in a thick cell of 125μm. Nevertheless, several domains of good uniformity are still present. Further, the polarization resolved LI characteristics of LC-VCSEL are investigated with and without the insertion of LC in a cell glued directly onto VCSEL package. Before filling in the LC, the VCSEL emits linearly polarized light and this linear polarization is lost after LC filling. The output intensity as a function of polarizer angle shows partial planar alignment of the E7 LC, which is very important for the further advancement of the LC-VCSEL integrated system.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Veena M. Nair, Veena M. Nair, Krassimir Panajotov, Krassimir Panajotov, Mikov Petrov, Mikov Petrov, Hugo Thienpont, Hugo Thienpont, Yi Xie, Yi Xie, Jeroen Beeckman, Jeroen Beeckman, Kristiaan Neyts, Kristiaan Neyts, } "850nm VCSEL with a liquid crystal overlay", Proc. SPIE 8432, Semiconductor Lasers and Laser Dynamics V, 84321X (15 May 2012); doi: 10.1117/12.922238; https://doi.org/10.1117/12.922238

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