Acta Optica Sinica, Volume. 40, Issue 3, 0319001(2020)
Control of Gaussian Optical Waves in Gaussian Parity-Time Symmetric Waveguide
The propagation control characteristic of Gaussian optical waves in parity-time (PT)-symmetric Kerr nonlinear planar waveguide with a Gaussian distribution is numerically studied based on the theoretical model of the optical-wave propagation in a PT-symmetric waveguide. The PT-symmetric waveguide requires the refractive-index distribution of the waveguide to have an even symmetry, whereas the gain/loss distribution must be odd. The results demonstrate that in the Gaussian PT-symmetric waveguide, the fundamental-mode Gaussian optical wave can form a wave-shaped beam that has a stable propagation. When the strength of the refractive-index distribution is increased, the oscillation frequency of the wave-shaped beam increases and the oscillation amplitude decreases. When the refractive index becomes larger, the two beams of the first-order Gaussian optical wave in the PT-symmetric waveguide can be restricted at the center of the waveguide, allowing stable propagation of the two beams. The second-order Gaussian optical wave requires a stronger refractive-index distribution for it to be restricted. This work lays a theoretical foundation for the application of PT-symmetric waveguide in all-optical switching control.
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Tingting Dang, Juanfen Wang. Control of Gaussian Optical Waves in Gaussian Parity-Time Symmetric Waveguide[J]. Acta Optica Sinica, 2020, 40(3): 0319001
Category: Nonlinear Optics
Received: Jul. 29, 2019
Accepted: Sep. 29, 2019
Published Online: Feb. 10, 2020
The Author Email: Wang Juanfen (dangting_12@163.com)