Research On Properties And Applications Of Photonic Crystal Microcavity

Since first proposed in1987, Photonic crystal (PhC) has received considerable attention for the fundamental physics study as well as various potential applications due to its excellent property of miniaturization and photonic band gap.The PhCs are engineered nanostructures which are capable of controlling and manipulating the propagation of electromagnetic waves within a certain frequency range.Various integrated nano-photonics devices have been proposed, such as channel drop filter, power splitter, coupler and so on.However, PhC cavity possesses not only the small volume but also the high quality and strong field confinement, which is a well-known approach to achieve sensor, channel drop filter and all optical switch and so on.This paper investigated the properties and potential applications of PhC cavity, the main work and research results are as follows:Performance analysis of biosensor based on PhC microcavity structure: A high-performance PhC resonator was proposed.By adjusting the structure of micro-cavity and changing the parameters of the first and second rows of air holes adjacent to the cavity, the coupling efficiency of micro-cavity and PhC waveguide could be greatly improved.Thus,molecule detection can be effectively conducted in the assigned area.The micro-injection technology can be used to achieve single-hole injection, so various biomolecule can be sensed and recognized with only tiny analyte.Besides, the sensitivity of sensors would be enhanced by adjusting the structure of cavity. At last,the system sensitivity could reach10nm/RIU, and the transmittance was up to0.67, which has improved more compare to the previous reports.Performance analysis and applications of PhC cavity with single-row hole:The coupling structure of PhC cavity with single-row hole and the W1 waveguide was studied and designed. The single-row hole was comprised of seven air holes.To achieve a high quality factor, the seven air holes were gradually altered. Then the quality factor could reach387.5and the transmittance could be up to0.75.The designed micro-cavity can be simultaneously applied to all optical switch, sensor and filter with favorable property. The modulation depth of optical switch based on intensity modulation was29.4db, the sensor sensitivity was104.2/RIU, the half-width of filter was4nm and can be applied in the system of four-channel coarse wavelength-division-multiplexing.The preparation experiment of photonic crystal based on SOI:The experimental test of PhC cavity and the PhC preparation based on SOI were studied and analyzed. Firstly, the experimental principle and building of PhC cavity was studied. Secondly, the design of funnel-shaped waveguide and the structural arrangement of SOI wafer. Thirdly, the PhC was fabricated by using the EBL technology, and the post processing, including grinding and polishing procedures, was also implemented.In conclusion, all the work and research results will bring great theoretical significance and reference value in guiding the future all optical network and all integrated circuits.