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Mode conversion and absorption in an optical waveguide under cascaded complex modulations

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Abstract

We investigate the mode conversion in a dielectric waveguide under spatially complex modulation, which refers to modulating both the real and imaginary parts of the dielectric permittivity. The complex modulations are applied separately in two distinct regions in the waveguide. The mode conversion can be controlled by adjusting the initial phase difference of the modulations in the two cascaded regions and by varying the phase difference of real and imaginary modulations in each region. The former is analogous to an Aharonov–Bohm (AB) phase and the latter suggests a symmetric propagation phase. Comparing to one modulated region, the cascaded modulations could benefit to realizing laser, coherent perfect absorber, and bidirectional invisibility. The study may contribute to the applications in optical switches and mode converters.

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Acknowledgements

This work was supported by the Program 973 (No. 2014CB921301); National Natural Science Foundation of China (Nos. 11304108 and 11674117).

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Authors and Affiliations

  1. Wuhan National Laboratory for Optoelectronics and School of Physics, Huazhong University of Science and Technology, Wuhan, 430074, China

    Qing-jie Liu & Wei-wei Liu

  2. Laboratory for Optical Information Technology, Wuhan Institute of Technology, Wuhan, 430205, China

    Shao-lin Ke

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  1. Qing-jie Liu
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  2. Shao-lin Ke
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Correspondence to Wei-wei Liu.

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Liu, Qj., Ke, Sl. & Liu, Ww. Mode conversion and absorption in an optical waveguide under cascaded complex modulations. Opt Quant Electron 50, 356 (2018). https://doi.org/10.1007/s11082-018-1617-7

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