Abstract
The utility model belongs to the field of optical devices, and provides a broadband transmission-type infrared light modulator based on graphene plasma in order to improve the modulation depth and bandwidth of the modulator, which comprises a substrate covered with a graphene modulation layer, and the modulation layer is provided with a non-metal grating layer through film coating etching. A metalgrating layer is arranged on the non-metal grating layer through a coating film, and a first electrode and a second electrode are arranged on the two sides of the substrate through coating films respectively. Graphene is coupled with a non-metal grating layer, the modulation depth and the modulation bandwidth of a device are greatly improved by utilizing the excellent polarization characteristicof a metal grating and the further enhanced field constraint capability to graphene local surface plasmon polaritons, the structure has strong reflection to TE linear polarization incident light, andthe polarization effect of the device is improved. Transmission modulation with high modulation depth in a wide band range can be realized for TM linearly polarized incident light, and the characteristic can realize a modulation function with high modulation depth and wide modulation bandwidth for transmitted light when natural light is incident.
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