Spatial Mode Selection by the Phase Modulation of Subwavelength Plasmonic Grating
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The extraordinary transmission of the subwavelength gold grating has been investigated by the rigorous coupled-wave analysis and verified by the metal–insulator–metal plasmonic waveguide method. The physical mechanisms of the extraordinary transmission are characterized as the excitation of the surface plasmon polariton modes. The subwavelength grating integrated with the distributed Bragg reflector is proposed to modulate the phase to realize spatial mode selection, which is prospected to be applied for transverse mode selection in the vertical cavity surface-emitting laser.
KeywordsSurface plasmon polariton Phase modulation Subwavelength plasmonic grating Mode selection
This work is supported by the National Natural Science Foundation of China under grant no.60876049, no.60906028, and no.60636030.