Optical coupling characteristics between a circular defect resonator and a waveguide in a two-dimensional photonic crystal slab

•We studied coupling between a defect and a waveguide in a 2dim photonic crystal.•The coupling efficiency strongly depends on the waveguide width.•A possibility of wavelength division multiplex has been indicated. To develop a wavelength division multiplexing (WDM) device using a photonic crystal (P...

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Published inPhotonics and nanostructures Vol. 31; pp. 168 - 172
Main Authors Miyamoto, Yuji, Xiong, Yifan, Okada, Tomoyuki, Morifuji, Masato, Kajii, Hirotake, Kondow, Masahiko
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 01.09.2018
Elsevier Science Ltd
Subjects
Atoms & subatomic particles
Banded structure
Cavity resonators
Crystal defects
Crystals
Luminous intensity
Optical coupling
Optics
Optimization
Photonic crystal
Photonic crystals
Wavelength division multiplexing
Wavelength division multiplexing
42.60.Da
Photonic crystal
42.55.Tv
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Summary:•We studied coupling between a defect and a waveguide in a 2dim photonic crystal.•The coupling efficiency strongly depends on the waveguide width.•A possibility of wavelength division multiplex has been indicated. To develop a wavelength division multiplexing (WDM) device using a photonic crystal (PC), we investigate coupling strength between a circular cavity resonator and a waveguide with various structural parameters. In the WDM device, light signals with various wavelengths generated in different cavity resonators travel through a single waveguide. Careful tuning of the cavity-waveguide coupling is necessary for practical operations, since the light signals must have the same intensities in the waveguide. Carrying out three-dimensional finite-differential time-domain (FDTD) calculations along with photonic bands, we search for the optimum structure for the WDM.
ISSN:1569-4410
1569-4429
DOI:10.1016/j.photonics.2018.06.002