The Frenquency Conversion Properties In The Reasonant Coupling Photonic Structure With The Dynamic Phase Modulation

In recent years,the interaction of light and matter has become a hot research in micronano optics.The research works are ranging from the exploration of physical mechanism of light-matter interaction to the demonstration of many applications,such as optical communication,optical device design and integration.The resonance and energy coupling in the micro-nano photonic structure are popular and important phenomena.The resonant coupling effects in the photonic structure not only be used to tailor the spectral response of the structure,but also contribute to many novel optical phenomena.In general,the resonant coupling effects are mainly determined by the geometric parameters of the structure.When the structural parameters are determined,the electromagnetic performance of structure are also fixed.If the dynamic modulation elements are introduced into the structure,the tunability of structure performance can be increase.Moreover,some new optical applications can be demonstrated based on the dynamic modulation.Based on the resonant-coupling phenomena in subwavelength photonic structures,this paper makes the following researches:(1)The electromagnetically induced transparency in metallic waveguide-microcavitystructureTwo metal microcavities linked by slits are designed in the metal waveguide,which eliminate the geometrical distance limitation between the microcavity and the waveguide.Using the direct coupling between the surface plasmon modes in the waveguide and the metal microcavity,the electromagnetically induced transparency phenomena are demonstrated in the transmission spectrum of the structure.The temporal coupled-mode theory is used to analyze the dynamic process of mode coupling in the cavity and to explain the physical mechanism of electromagnetically induced transparency in the structure.The influence of the width and position of slits on the transparent window of the structure are also discussed.(2)Fano anti-resonance phenomena in dielectric waveguide ridge structureIn the double dielectric ridges structure,the indirect coupling between the resonance modes in the waveguide ridges contributes to the Fano resonance and Fano anti-resonance of the structure's spectral response.The Fano parameters are theoretically derived using the temporal coupled-mode theory and the Fano formula.The two types of suppressed transmission caused by the Fano anti-resonance are theoretically interpreted.For the case of two ridges with the same geometrical parameters,the bound states in the continuum caused by the existence of Fano anti-resonance in the structure can be observed,which greatly increases the Q factor of the structure.(3)The frequency conversion properties in multi-layers film structure with dynamic phasemodulationA multilayer film structure is designed,which supports two resonant coupling modes.By introducing the dynamic phase modulation into the multilayers,the resonant modes can achieve the phase difference by changing the external modulation phase.It is observed that the left and right sidebands of the fundamental frequency in the reflected harmonics will are dependent on the modulation phase,and can form a modulation-based phase asymmetric frequency conversion.Using temporal coupled-mode theory,a three-mode coupling model was established to explain the generation mechanism of asymmetric frequency conversion.