Structural Design And Performance Study Of Nanocavity And Filter Based On The Holographic Photonic Quasicrystals

With the rapid development of Semiconductor Integrated Circuitry(SIC),the human life has been enhance greatly by the booming Information Technology(IT).For example,smart phones,household goods,have met most of the needs of daily life.Due to physical reasons,the increscent coulombic forces and thermal effects,as a consequence of electrons,will not be neglected,which leading to a series of tough issues when the integration level reaches the threshold.Conversely,more and more people are now beginning to go down the path that photon as an informational vehicle,for the advantages of photon including high speed transmission and weak interaction.Photonic crystal can manipulate photons which is analogous to the case of electrons in semiconductors.It is not an aspiration until the photon industy has been established as a pillar industry with the help of integrated optical circuit.Quasi-periodic photonic crystal,the photonic quasicrystal(PQC),has profound preponderances,for instance,low-threshold complete band gap,insensitive directivity in band gap and abundant bandgaps,compared with periodic structure.PQC has been a hot research area.In addition,photonic device turn into a favored candidate in research field.The main content of this article is the investigation on low-threshlold nanocavity and narrowband filter based on PQC.Details are as follows.1.The design of a low-threshlold nanocavity,for solving the problems of size reduction,massively fabricate and the threshold increases.(1)First of all,the 12-fold PQC was formed by using the method of interference.Then,a nanocavity was designed based on the silicon.The transmission spectrum was obtained.Under the guidance of band theory,the structural parameters of nanocavity were optimized.A cavity with better performance on convergence will be chosen to confine the motion of photons in two-dimensional plane.The Q factor and mode volume will be calculated by fine-tuning operations about the radius and the position of the air-hole.Ultimately,the optimized structural parameters will be obtained in order to improve Q factor and to diminution the mode volume.(2)The evaluation method based on Fourier Transform(FT)has been employed.It has been proved that the simulative results are consistent with the theoretical analysis by means of the FT along the symmetry axes of the cavity.The investigation is of great significance to the fabrication of low threshold PQC nanocavity laser.2.The design of a narrowband filter based,for solving the problems of oversize and complex in integration with low loss and large broadband.(1)The narrowband filter was designed based on a holographic 8-fold PQC.The performance of the filter was optimized under the guidance of band gap theory aiming at the narrower band and higher transmissivity.(2)Comparing with the variation trend of central wavelength and 3dB bandwith,the central wavelength of the transmission peak will be redshifted by fine-tuining refractive index.In addition,there is no saltation in wastage and bandwidth.(3)Two empirical formulas for designing filter at various wavelengths were obtained from the calculated results,which is expected to help the design of other devices based on the filter structure.Besides,for its better linearity of the resonance,the investigation is of great significance to the fabrication of sensor design.