doi:

DOI: 10.3724/SP.J.1249.2019.02140

Journal of Shenzhen University Science and Engineering (深圳大学学报理工版) 2019/36:2 PP.140-146

Efficient terahertz wave generation based on hybrid micro-cavity


Abstract:
By utilizing the nonlinear optical frequency-difference effect, an efficient terahertz (THz) wave generator based on a hybrid micro-cavity of whispering gallery (WG) mode and surface plasmonic mode is proposed and investigated. Simulations based on finite element method are performed. It is found that the THz wave at the frequency 11.7 THz can be produced at room temperature, and the terahertz modal volume is small, which breaks the diffraction limit, the sub-wavelength confinement in turn produces a high Purcell factor up to 7.2×103 (one in cubic of the THz wavelength in GaAs). Further studies show that the conversion efficiency can reach the quantum limit (~5.5%), and the maximum output of the generated THz wave is as high as 166.3 mW. The advantages of the design include:capability for operation at room temperature, high conversion efficiency that approaches to the quantum limit, high output power for the THz wave, and convenience for all-optical integration.

Key words:nonlinear optics,optical frequency-difference effect,whispering gallery mode,surface plasmonic mode,sub-wavelength confinement,terahertz wave generation

ReleaseDate:2019-12-02 09:24:37



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