Research On Micro-nanostructure Devices Based On Triangular Resonant Cavit

In order to meet the needs of social development for more miniaturized,lower loss and higher speed devices,micro and nano photonic devices are gradually used in many fields.Due to the existence of traditional optical diffraction limit,the further development of micro and nano photonic devices is hindered.In order to break through the traditional diffraction limit and design photonic devices with higher performance,this paper proposes three kinds of micro and nano structures based on triangular resonator: multichannel all-optical switch,tunable multifunctional sensor with plasmonically induced transparency and dual-channel mid-infrared imageable metasurface.Specific works are shown as follows:(1)Multi-channel all-optical switch: A multi-channel all-optical switch based on an equilateral triangular resonator with a silver bar is proposed.Transmission spectra and electromagnetic field distributions of optical switch are calculated by employing two main methods including FDTD and CMT.Varying the geometric parameters of optical switch,refractive index and the resonance wavelength of the system can be varied.Rotating the silver bar can realize the change of transmission spectra in different channels,and maximum contrast ratio can be up to 36 d B.(2)Tunable multifunctional sensor with plasmonically induced transparency: A system is designed based on triangular resonator,which is employed as a multifunctional sensor with plasmonically induced transparency.Electric field and temperature sensors can be realized adding E7 liquid crystal into the triangular resonators of the system.And refractive index of liquid crystal is varied when adding applied electric field or heat source.In addition,compared with the above research,the sensor becomes tunable,when adding external electric field into original system and changing refractive index of liquid crystal.(3)Dual-channel mid-infrared imageable metasurface: A dual-channel mid-infrared imageable metasurface based on an equilateral triangular resonator is proposed.Two main methods are employed to calculate reflectance spectra and magnetic field profiles of the system.The resonance wavelength of structural cell of the system at channel A does not change with the polarization angles and the surrounding temperature,while resonance frequency at channel B changes with the polarization of the incident light and the external temperature.The metasurface designed based on this structural cell realize code imaging and thermal imaging in channel B,while these functions are turned off in channel A.