Metallic photonic crystal slab super transmittance and low -dimensional structures of phonon transport
|School||Central South University|
|Keywords||Metallic photonic crystals Low -dimensional nanostructures Coupling Phonon transport Thermal conductivity Prohibit Band|
Metallic photonic crystal slab enhanced transmission effect, the waveguide cavity Fabry resonance effect and the metal plate on the surface of the photonic crystal periodic together cause the surface plasmon resonance, thereby increasing the transmission of electromagnetic waves results. On which the application of the filter element, designed in a particular frequency band of the metal structure of photonic crystal slab. Superlattices, quantum well and quantum wire and other low-dimensional nanostructures materials with novel physical properties and broad application prospects, has become condensed matter physics and materials science research focus, more and more attention. At the same time, nano-preparation and processing technology is developing rapidly, requiring a deeper understanding of nanoscale devices, structures and materials. In this paper, metallic photonic crystal slab enhanced transmission and low-dimensional structures phonon transport properties of two aspects made useful explorations, and get some meaningful results. Its main work is as follows: 1. Using full vector three-dimensional FDTD method to analyze metallic photonic crystal slab enhanced plasma wave propagation effects. In addition to the waveguide cavity Fabry resonance effect, the photonic crystal slab and the metal of the periodic structure on the surface will cause the surface plasmon resonance thereby improving the transmission of electromagnetic waves. This enhanced effect from two different resonant mechanisms: Fabry local plasma wave guide cavity resonance and plasmon resonance caused by the periodic. Respectively, through the zero-order transmission as well as 1 and -1 order of diffraction to study these two resonance mechanism, the use of point group theory analysis of different structures of these two different resonance frequency distribution and the transmission spectrum peaks characteristic. (2) using the scattering matrix method to study the low temperature closed end opposite side double quantum waveguide acoustic phonon transport and thermal conductivity properties. The results show that: Each phonon mode threshold frequency depends on the closed end of the line height; Since the coupling effects between the ends of lines, with the ends of the thermal conductivity change in the width between the lines showing the oscillation damping behavior; addition, the end of the line width and height on the thermal conductivity has a significant impact. 3 of a low temperature, two concave side of the quantum waveguides and acoustic phonon thermal conductivity of transport, and with the opposite side of the double-projecting end structures for the transmission and thermal conductivity compared. Found some interesting phenomena: (1) With recessed end to end line h (h ≤ 10nm) increased, the quantum phonon waveguide transmission coefficient decreases rapidly due to the higher end line sag enhances quantum waveguides phonons reflection, zero-mode phonon transmission coefficient curve appeared wide ban band; (2) With the end of the line increased double concave side of the thermal conductivity of quantum waveguide decreases rapidly, while the double convex side of the thermal conductivity of quantum waveguides decrease more slowly; (3) phonon thermal conductivity and transmission coefficient of K / T between the two ends of the width L of the recess are very sensitive to changes.