采用时域有限差分法,研究了八重光子准晶微腔型光学传感器的物理特性。研究结果表明,光子准晶微腔具有高品质的共振模,其场被高度局域在腔中心,并向周边对称性扩展,呈现出高度的八重旋转对称性。由于缺陷模场扩展到微腔的周边环境中,使得模场能与外部环境产生强烈的相互作用,因此实现了高灵敏度的光学传感。在光通信波段长1 550 nm时,折射率灵敏度达到了700 nm／RIU。研究结果为实现一类新型光子准晶型高灵敏度生物传感器提供了重要的依据。

The physical characteristics of octagonal photonic quasicrystals-based optical sensors are investigated by the finite-difference time-domain method. The results show that photonic quasicrystal microcavity has high quality resonant modes, and the electric field exhibiting 8-fold rotational symmetry can be highly confined in the cavity as well as extended symmetrically around the cavity. High index sensitivity of optical sensors can be achieved due to the strong interaction between the resonant mode and surroundings. The interaction originates from that the modal profiles of the surface guided modes in the surface waveguides extendly into the outer surroundings. The index sensitivity within the communication wave band 1550nm arrives at 700nm／RIU. The results open up a new route for the realization of high index sensitivity bissensors based on photoninc quasicrystals.