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Home List of Titles Microvoid channel polymer photonic crystals with large infrared stop gaps and a multitude of higher-order bandgaps fabricated by femtosecond laser drilling in solid resin
Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/3520
- Microvoid channel polymer photonic crystals with large infrared stop gaps and a multitude of higher-order bandgaps fabricated by femtosecond laser drilling in solid resin
- Straub, Martin H.; Ventuta, Michael; Gu, Min
- Photosensitive previous termpolymernext term materials are ideally suited for laser-induced micro- and nanostructuring, as structural and compositional changes are achieved already under exposure to moderate intensities of high-repetition rate ultrashort-pulsed light. previous termPhotonic crystals with bandgapsnext term in the previous terminfrarednext term or the visible spectral region are previous termanext term particularly interesting application, because highly correlated structural elements at previous termanext term size of only previous termanext term few hundred nanometers are required. We fabricated previous terminfrared photonic crystalsnext term based on previous termmicrovoid channelsnext term inside solid previous termpolymernext term material. Femtosecond-pulsed visible light was focused into UV-cured Norland NOA63 resin by previous termanext term high numerical aperture objective. In the focal spot microexplosions drive the material out of the center of the focus. Void previous termchannelsnext term of 0.7–1.3 μm diameter are generated by translating the sample along previous termanext term preprogrammed pathway. Woodpile structures of void previous termchannelsnext term at layer spacings of 1.6–2.6 μm and in-plane previous termchannelnext term spacings of 1.2–1.3 μm allowed for previous termbandgapnext term-induced suppression of previous terminfrarednext term transmission in the stacking direction of as much as 86% by only 20 layers. As these structures are highly correlated and do not contain many imperfections, up to three previous termhigher-order stop gapsnext term are observed. Consistent with theory, the number and gapwidth of previous termhigher-order gapsnext term strongly increases with the ratio between layer- and in-plane spacing. Due to their low refractive index contrast and the missing interconnectivity of voids our structures do not provide complete previous termphotonic bandgaps.next term However, their manifold of sizable previous termhigher-order gapsnext term allows for the engineering of previous termphotonic stop gapsnext term down to the near-previous terminfrarednext term wavelength region using comparatively previous termlargenext term structural dimensions.
- Publication type
- Conference paper
- Research centre
- Swinburne University of Technology. Faculty of Engineering and Industrial Sciences. Centre for Micro-Photonics
- Proceedings of Symposium H on Photonic Processing of Surfaces, Thin Films and Devices, of the E-MRS 2003 Spring Conference, Vol. 453-454 (Apr. 2004), pp. 522-526
- Publication year
- Femtosecond laser drilling; Void channels; Polymer microstructures; Thermoset resins; Photonic bandgap materials; Higher-order stop gaps
- Publisher URL
- Copyright © 2003 Elsevier B.V. All rights reserved.
- Peer reviewed