Local observation of modes from three-dimensional woodpile photonic crystals with near-field microspectroscopy under supercontinuum illumination |
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| Authors: | Jia Baohua Norton Andrew H Li Jiafang Rahmani Adel Asatryan Ara A Botten Lindsay C Gu Min |
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| Affiliation: | Centre for Micro-Photonics and Centre for Ultrahigh-bandwidth Devices (CUDOS), Faculty of Engineering and Industrial Sciences, Swinburne University of Technology, P.O. Box 218, Hawthorn, 3122 Victoria, Australia. bjia@swin.edu.au |
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| Abstract: | A near-field microscope coupled with a near-infrared (NIR) supercontinuum source is developed and applied to characterize optical modes in a three-dimensional (3D) woodpile photonic crystal (PC) possessing a NIR partial bandgap. Spatially resolved near-field intensity distributions under different illumination wavelengths demonstrate that the electric fields preferentially dwell in the polymer rods or in the gaps between rods, respectively, for frequencies below or above the stop gap, as predicted by the 3D finite-difference time-domain modeling. Near-field microspectroscopy further reveals that the position-dependent band-edge effect plays an important role in PC-based all-optical integrated devices. |
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