Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/25408

Title

Direct mapping of dynamics of three-dimensional woodpile photonic crystals fabricated with two-photon polymerisation

Author(s)

Jia, Baohua;  Li, Jiafang;  Gu, Min

Abstract

Photonic crystals (PCs) as a promising candidate for next generation all-optical devices have been intensively studied. The fabrication materials of such crystals vary from high index semiconductors to comparatively low index polymers. Recently the direct experimental evidence of the superprism effect in low-index three-dimensional (3D) polymer PCs demonstrates their great potential to directly serve as functional micro-optical devices in the near-infrared (NIR) wavelength regime [1]. In particular, the combination of these PCs and nanoparticles such as semiconductor nano-crystal quantum dots will result in an entirely new type of active PCs. To understand the functionality and dynamics of the active PCs, one needs high resolution optical microscopy and spectroscopy devices. As a powerful tool capable of detecting near-field signals, scanning near-field optical microscope (SNOM) has recently been applied to study the detailed local intensity distributions in two-dimensional PC structures, which provides the previously inaccessible information on the optical properties of the devices. In this paper, a SNOM is utilised to study the optical dynamic distributions from 3D woodpile PCs fabricated by the two-photon polymerisation (2PP) technique. The fabricated PCs have a lattice spacing of 700 nm, which enable a partial photonic band gap in the ґ-ҳ direction in the NIR (1.19 -1.23 µm) region. A SNOM is employed to collect the diffracted light in the ґ-ҳ direction. The topological and the optical dynamics of the PCs are obtained simultaneously with sub-wavelength resolution. Illumination light with a wavelength spanning from below to above the fundamental partial band gap is utilised. The optical signals from the SNOM, particularly the near-field part, reveal the variations of the mode confinement and light propagation in the PCs at different wavelengths. The methodology presented in this paper is particularly promising in understanding the radiation dynamics of 3D PCs in which quantum dots are doped or inflitrated.

Publication type

Conference paper

Research centre

Swinburne University of Technology. Faculty of Engineering and Industrial Sciences. Centre for Micro-Photonics

Source

[Proceedings] RiverPhys : Australian Institute of Physics 17th National Congress 2006, Brisbane, Queensland, Australia, 03-08 December 2006

Publication year

2006

Publisher

Australian Institute of Physics

ISBN

0959806474