Xi Gao

Properties of obliquely incident electromagnetic wave in one-dimensional magnetized plasma photonic crystals

Properties of obliquely incident electromagnetic wave in one-dimensional (1D) magnetized plasma photonic crystals (PPCs) are studied in this paper. Based on the continuous boundary condition of electromagnetic wave in 1D PPC, transfer matrix equation and dispersion equation of transverse magnetic polarization are deduced, and the properties of dispersion and transmission relation in terms of external magnetic field, collision frequency, and dielectric constant of dielectric and incident angles are investigated, respectively. Results show that gap location and gap width can be effectively controlled by adjusting external magnetic field as well as incident angle, and increasing collision frequency has little effect on gap width while larger dielectric constant of dielectric leads to more gaps.Properties of obliquely incident electromagnetic wave in one-dimensional (1D) magnetized plasma photonic crystals (PPCs) are studied in this paper. Based on the continuous boundary condition of electromagnetic wave in 1D PPC, transfer matrix equation and dispersion equation of transverse magnetic polarization are deduced, and the properties of dispersion and transmission relation in terms of external magnetic field, collision frequency, and dielectric constant of dielectric and incident angles are investigated, respectively. Results show that gap location and gap width can be effectively controlled by adjusting external magnetic field as well as incident angle, and increasing collision frequency has little effect on gap width while larger dielectric constant of dielectric leads to more gaps.

Dispersion properties of a 2D magnetized plasma metallic photonic crystal

This is a study on a 2D magnetized plasma-filled metal photonic crystal (PMPC). We analyze the dispersion relation of the magnetized PMPC by using the finite-difference time-domain method. Results show a cutoff frequency for the PMPC, and two flat bands and new forbidden band gaps appear due to the external magnetic field. Adjusting the external magnetic field can control the positions of the flat bands, cutoff frequency, and location and width of the local gap. These results provide theoretical basis for designing tunable photonic crystal devices.

Design of Photonic Crystal Resonant Cavity Using Overmoded Dielectric Photonic Band Gap Structures

An overmoded photonic crystal resonant cavity with two dimensional dielectric lattice structures is proposed and simulated. The dominant mode is a higher-order TM03-like at the frequency of 31.14GHz, the fundamental mode and most other modes are not supported by the cavity. The structure would be potential for application in accelerator, gyrotron and klystron in Ka-band. DOI: 10.2529/PIERS061007043414

Bandgap extension of disordered one-dimensional metallic-dielectric photonic crystals

Photonic crystal (PC) with a photonic band gap (PBG) has attracted much attention since the initial predictions of Yablonovitch and John. This active research area has been extended to frequency-dependent metallic-dielectric PC (MDPC) theoretically and experimentally in Keskinen, M.J., et al, (2000). In this paper, the PBG properties are investigated by transform matrix method when disorder is introduced in the one-dimensional (1D) frequency-dependent MDPC.

Research on Three Types of Rhombus Lattice Photonic Band Structures

The gap-midgap ratio for three types of rhombus lattice photonic band structures are analyzed by plane wave expansion method, which is confirmed by the HFSS simulation. Firstly, general wave vectors in the first Briliouin zone are derived. Secondly, the gap-midgap ratios as a function of filling factor and background material are investigated, respectively. These results would provide theoretical instruction for designing arbitrary bend waveguides or other optical integrated devices using photonic crystal with a rhombus lattice.

Analysis of two-dimensional photonic band gap structure with a rhombus lattice

The relative band gap for a rhombus lattice photonic crystal is studied by plane wave expansion method and high frequency structure simulator (HFSS) simulation. General wave vectors in the first Briliouin zone are derived. The relative band gap as a function of air-filling factor and background material is investigated, respectively, and the nature of photonic band gap for different lattice angles is analyzed by the distribution of electric energy. These results would provide theoretical instruction for designing optical integrated devices using photonic crystal with a rhombus lattice.

P3-36: Dispersion properties of plasma-filled two-dimensional metallic photonic crystals

The dispersion characteristics of two-dimensional (2D) plasma-filled metallic photonic crystals (PC) with square lattice are studied by the finite-difference time-domain (FDTD) method. The results show that the dispersion curves of TM and TE modes all move to higher frequency when the PC filled with plasma. Furthermore, a cut-off frequency appears in the first passing band of TE mode due to the existing of background plasma.

Study on relativistic Cherenkov source with metallic photonic band-gap structure

A Ka-band slow-wave structure consists of a two-dimensional metallic photonic band-gap and a slow-wave plate as its periodic unit. The photonic band-gap (PBG) structure, whose front view is shown in Fig.1, has a defect in the central of the triangular lattices. In metallic band gap, the first band gap begins from the zero frequency, which makes the TM01-like mode always appear in defect, so the appropriate parameters can be designed to suppress all the higher-order TM0n-like ( n ges 2 ) modes [1,2]. The parameters of photonic band-gap and the slow-wave structure are shown in Table I.