Magneto-optical Kerr effect and photonic bandgap in cobalt nanodisc array

Kin Man Tsia; Chi Lok Cheng; Silas T. Hung; Andrew W. Poon

doi:10.1117/12.520374

12 May 2004 Magneto-optical Kerr effect and photonic bandgap in cobalt nanodisc array

Kin Man Tsia, Chi Lok Cheng, Silas T. Hung, Andrew W. Poon

Proceedings Volume 5280, Materials, Active Devices, and Optical Amplifiers; (2004) https://doi.org/10.1117/12.520374
Event: Asia-Pacific Optical and Wireless Communications, 2003, Wuhan, China

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.

Citation Download Citation

Kin Man Tsia, Chi Lok Cheng, Silas T. Hung, and Andrew W. Poon "Magneto-optical Kerr effect and photonic bandgap in cobalt nanodisc array", Proc. SPIE 5280, Materials, Active Devices, and Optical Amplifiers, (12 May 2004); https://doi.org/10.1117/12.520374

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