Photonic crystal light deflection devices using the superprism effect

Author

Baba, Toshihiko ; Nakamura, Masanori

Author_Institution

Div. of Electr. & Comput. Eng., Yokohama Nat. Univ., Japan

Volume

38

Issue

7

fYear

2002

fDate

7/1/2002 12:00:00 AM

Firstpage

909

Lastpage

914

Abstract

The superprism effect allows wide-angle deflection of the light beam in a photonic crystal (PC) by a slight change of the wavelength or the incident angle. In this paper, we discuss such light deflection outside the PC, which is expected when the output end of the PC is tilted against the input end. The analysis of the dispersion surfaces indicates a deflection angle of ±50° in a two-dimensional PC composed of triangular lattice airholes by changing the incident angle by ±2° or the wavelength by ±2%. Light deflections inside and outside the PC are numerically demonstrated by the finite difference time-domain method. It displays not only the main output beam but also many diffracted waves, which satisfy the wavevector conservation condition. These waves are sufficiently suppressed and an almost collimated output beam is realized by a flat interface

Keywords

finite difference time-domain analysis; micro-optics; optical deflectors; optical prisms; photonic band gap; collimated output beam; deflection angle; diffracted waves; dispersion surfaces; finite difference time-domain method; flat interface; incident angle; input end; light deflection; main output beam; output end; photonic crystal; photonic crystal light deflection devices; superprism effect; triangular lattice airholes; two-dimensional PC; wavevector conservation condition; wide-angle deflection; Diffraction; Dispersion; Displays; Frequency; Lattices; Optical refraction; Optoelectronic and photonic sensors; Personal communication networks; Photonic crystals; Surface waves;

fLanguage

English

Journal_Title

Quantum Electronics, IEEE Journal of

Publisher

ieee

ISSN

0018-9197

Type

jour

DOI

10.1109/JQE.2002.1017606

Filename

1017606