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My research is an experimental study of an optical beam steering phenomenon based on EO effect and space-charge-controlled electrical condition. A large deflection angle is expected by applying a relatively low voltage to a 0.5-mm-thick KTN crystal with a short interaction length of 5.0 mm. In theory, the electrical condition is carrired by electrons injected from the Ohmic contact of the electrodes. The injected electrons induce the space-charge effect and the electrical field becomes uniform while the electrical field has a square root dependence on the distance from the cathode. So, a linearly graded refracted index is induced and the optical beam is cumulatively deflected as it propagates in the crystal.

Publication Date


Project Designation

Graduate Research

Primary Advisor

Qiwen Zhan

Primary Advisor's Department

Electro Optics Graduate Program


Stander Symposium poster

Beam steering by KTN crystal(Potassium tantalate niobate)