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Proceedings Paper

Magneto-optical Kerr effect and photonic bandgap in cobalt nanodisc array
Author(s): Kin Man Tsia; Chi Lok Cheng; Silas T. Hung; Andrew W. Poon
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Paper Abstract

In this paper, we report our experimental investigation on two-dimensional (2-D) magneto-photonic crystals (MPCs) by using high-precision magneto-optical Kerr effect (MOKE) measurement. Our 2-D MPC is in the form of a periodic triangular array of cobalt (Co) circular nano-discs on a silicon (Si) substrate. Preliminary longitudinal MOKE measurement reveals a hysteresis loop that suggests a saturated Kerr rotation of ≈ 0.05°. We numerically investigate the potential photonic band gap (PBG) phenomenon of a triangular nano-disc array with the Co real refractive index = 2.26 by using 2-D finite-different time-domain (FDTD) method. We observe relatively wide TM-polarization (E-field⊥substrate) band gaps in the 1550-nm telecommunication wavelengths: 500 nm in the -M Γ direction whereas 400 nm in the -K Γ direction.

Paper Details

Date Published: 12 May 2004
PDF: 9 pages
Proc. SPIE 5280, Materials, Active Devices, and Optical Amplifiers, (12 May 2004); doi: 10.1117/12.520374
Show Author Affiliations
Kin Man Tsia, Hong Kong Univ. of Science and Technology (Hong Kong China)
Chi Lok Cheng, Hong Kong Univ. of Science and Technology (Hong Kong China)
Silas T. Hung, Hong Kong Univ. of Science and Technology (Hong Kong China)
Andrew W. Poon, Hong Kong Univ. of Science and Technology (Hong Kong China)


Published in SPIE Proceedings Vol. 5280:
Materials, Active Devices, and Optical Amplifiers
Connie J. Chang-Hasnain; Dexiu Huang; Yoshiaki Nakano; Xiaomin Ren, Editor(s)

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