微纳结构光电子物理与器件

Physics of Nanostructures and Optoelectronic Devices based on Them

类比于晶体中电子的能带结构,各种粒子、准粒子的能量-动量关系可以看作是一种"广义能带"。介绍了通过微纳结构对光子、声子、表面等离子激元广义能带的调控,获得的不同于传统材料的新颖光电特性及其在新功能器件中的应用,包括超小型宽带慢光波导光开关(带宽24nm,尺寸8μm×17μm)、异质结构光声晶体悬臂微腔(声子频率高达5.66GHz)、基于"双表面等离子激元吸收"的超衍射光刻,以及基于双曲超材料的无阈值切伦科夫辐射等。

In analogy to the energy-bands of electrons, the energy-momentum relations of other fundamental particles （such as photons）, quasi-particles （such as phonons）, and polaritons can be considered as ＂general energy-bands＂. This report indicates that by manipulating so called ＂general energy bands＂ of fundamental particles or quasi-particles, such as photon, phonon, and surface plasmon polariton （SPP）, novel optoelectronic characteristics can be obtained, which results in a series of new functional devices. A silicon based optical switch with an extremely broadband of 24 nm and an uhracompact （8μm×17μm） footprint was demonstrated with a photonic crystal slow light waveguide. By pro- posing a nanobeam based hetero optomechanical crystal, a high phonon frequency of 5. 66 GHz was realized experimen tally. Also, we observed and verified a novel effect of two-surface plasmorrabsorption （TSPA）, and realized diffraction-limit overcoming photolithography with resolution of --1/11 of the exposure wavelength. Beyond those, a thresh- old-less Cherenkovradiation was demonstrated with hyperbolic metamaterial.