Asymmetry reversal and waveguide modes in photonic crystal slabs

Asymmetry reversal and waveguide modes in photonic crystal slabs

Driessen, E.F.C.
Heemskerk, P.O.M.
Stolwijk, D.
Van der Drift, E.W.J.M.
De Dood, M.J.A.

Applied Sciences

Nanofacility

2008-05-23

The measured reflection spectra of two-dimensional photonic crystal slabs consist of an asymmetric peak on top of an oscillating background. For p-polarized light, the asymmetry of the peak flips for angles of incidence beyond Brewster’s angle. We explain the observed line shapes with a Fano model that includes loss and use a waveguide model to predict the resonance frequencies of the photonic crystal slab. Finite-difference time domain calculations support the model and show that the resonance due to a higher order mode disappears when the substrate refractive index is increased beyond ns = 2.04. This is readily explained by the cut-off condition of the modes given by the waveguide model.

photonic crystals
waveguides
fano resonances

http://resolver.tudelft.nl/uuid:74a1b85f-b0c3-4519-87da-e71f1960dd4e

SPIE

0277-786X

Proceedings of SPIE, 2008 vol. 6989

Institutional Repository

conference paper

(c)2008 Driessen, E.F.C., Heemskerk, P.O.M., Stolwijk, D., Van der Drift, E.W.J.M., De Dood, M.J.A.