Quasiguided modes and optical properties of photonic crystal slabs

Tikhodeev, Sergei G., Muljarov, Egor A. ORCID: https://orcid.org/0000-0002-2878-4148, Yablonskii, A. L., Gippius, N. A. and Ishihara, Teruya 2002. Quasiguided modes and optical properties of photonic crystal slabs. Physical Review B 66 (4) , 054102. 10.1103/PhysRevB.66.045102

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Abstract

We formulate a scattering-matrix-based numerical method to calculate the optical transmission properties and quasiguided eigenmodes in a two-dimensionally periodic photonic crystal slab (PCS) of finite thickness. The square symmetry (point group C4v) is taken for the illustration of the method, but it is quite general and works for any point group symmetry for one-dimensional (1D) and 2D PCS’s. We show that the appearance of well-pronounced dips in the transmission spectra of a PCS is due to the interaction with resonant waveguide eigenmodes in the slab. The energy position and width of the dips in transmission provide information on the frequency and inverse radiative lifetime of the quasiguided eigenmodes. We calculate the energies, linewidths, and electromagnetic fields of such quasiguided eigenmodes, and analyze their symmetry and optical activity. The electromagnetic field in such modes is resonantly enhanced, which opens possibilities for use in creating resonant enhancement of different nonlinear effects.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QC Physics
Publisher:	American Physical Society
ISSN:	1098-0121
Last Modified:	04 May 2023 14:21
URI:	https://orca.cardiff.ac.uk/id/eprint/1610

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