Investigation on two dimensional photonic crystal resonant cavity based bandpass filter

In this paper, different cavities, namely quasi square, tri-quarter square, square, hexagonal, circular, elliptical, diamond and annular ring based photonic crystal bandpass filters (PCBPFs) are proposed and investigated by exploiting coupling between two in-line quasi waveguides and a resonant cavi...

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Bibliographic Details
Published in:Optik (Stuttgart) 2012-03, Vol.123 (5), p.451-457
Main Authors: Robinson, S., Nakkeeran, R.
Format: Article
Language:English
Subjects:
Bandpass filter
Bandpass filters
Cavity resonators
FDTD method
Holes
Mathematical analysis
Photonic band gap
Photonic crystal
Photonic crystals
Photonics
Plane waves
Resonant cavity
Wavelength division multiplexing
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Summary:In this paper, different cavities, namely quasi square, tri-quarter square, square, hexagonal, circular, elliptical, diamond and annular ring based photonic crystal bandpass filters (PCBPFs) are proposed and investigated by exploiting coupling between two in-line quasi waveguides and a resonant cavity. The resonant wavelength, output efficiency and bandwidth of designed PCBPFs are studied by varying the size of the cavity. The normalized transmission spectra of PCBPF are observed using 2D finite difference time domain (FDTD) method. The photonic band gap (PBG) is calculated by plane wave expansion (PWE) method. The circular cavity based PCBPF gives better performance than others because of its circular resonating modes. The number of passbands is increased linearly while increasing the size of the cavity. The overall size of the PCBPF chip is about 11.4μm×11.4μm, which is more suitable for photonic integrated circuits (PIC), wavelength division multiplexing (WDM) systems and sensing applications.
ISSN:0030-4026
1618-1336
DOI:10.1016/j.ijleo.2011.05.004