共查询到10条相似文献,搜索用时 234 毫秒
1.
Fabrication of two- and three-dimensional periodic submicron structures by holographic lithography with a 635~nm laserand matched photopolymer 下载免费PDF全文
2D and 3D submicron periodic structures are first
fabricated by red-induced photopolymerization using a common 635 nm
semiconductor laser and specially developed red-sensitive polymer
material. The principle of this new photo-polymer material
fabrication is explained and the absorption spectra of the material
are measured. This fabrication technique allows a deeper penetration
into volume and larger interference irradiation area which is more
than 1 cm2. The optical design, theoretical calculations
and experimental results including diffraction patterns
verifying the formation of periodic structures are presented.
Compared with other fabrication technologies using high-power
lasers, this approach has greatly reduced the demand for laser
apparatus. Therefore, it is much more accessible to most
laboratories and potentially usable in holographic fabrication of
photonic crystals and devices in micro electro-mechanical
systems (MEMS). 相似文献
2.
Sun HB Xu Y Juodkazis S Sun K Watanabe M Matsuo S Misawa H Nishii J 《Optics letters》2001,26(6):325-327
We used voxels of an intensely modified refractive index generated by multiphoton absorption at the focus of femtosecond laser pulses in Ge-doped silica as photonic atoms to build photonic lattices. The voxels were spatially organized in the same way as atoms arrayed in actual crystals, and a Bragg-like diffraction from the photonic atoms was evidenced by a photonic bandgap (PBG) effect. Postfabrication annealing was found to be essential for reducing random scattering and therefore enhancing PBG. This technique has an intrinsic capability of individually addressing single atoms. Therefore the introduction of defect structures was much facilitated, making the technique quite appealing for photonic research and applications. 相似文献
3.
Femtosecond laser-induced two-photon polymerization of inorganic-organic hybrid materials for applications in photonics 总被引:1,自引:0,他引:1
Serbin J Egbert A Ostendorf A Chichkov BN Houbertz R Domann G Schulz J Cronauer C Fröhlich L Popall M 《Optics letters》2003,28(5):301-303
Investigations of two-photon polymerization of inorganic-organic hybrid materials initiated by femtosecond Ti:sapphire laser pulses are performed. First applications of this technique for the fabrication of three-dimensional microstructures and photonic crystals in inorganic-organic hybrid polymers with a structure size down to 200 nm and a periodicity of 450 nm are discussed. 相似文献
4.
M. Farsari A. Ovsianikov M. Vamvakaki I. Sakellari D. Gray B. N. Chichkov C. Fotakis 《Applied Physics A: Materials Science & Processing》2008,93(1):11-15
Direct laser writing by two-photon polymerization of photosensitive materials has emerged as a very promising technique for
rapid and flexible fabrication of photonic crystals. In this work, a photosensitive silica sol-gel containing the nonlinear
optical chromophore Disperse Red 1 is synthesized, and the two-photon polymerization technique is employed to fabricate three-dimensional
photonic crystals with stop-gaps in the near-infrared. The composite material exhibits minimal shrinkage during photopolymerization,
eliminating the need for shrinkage compensation or the fabrication of support structures. 相似文献
5.
We demonstrate the fabrication of complicated three-dimensional (3D) microstructures embedded in a photosensitive glass by a high-order multiphoton process using a femtosecond (fs) laser. Direct writing of the fs laser followed by a post baking process and preferential etching in a dilute hydrofluoric (HF) acid solution results in a microplate that can freely move in hollow structures embedded in the glass. The fabricated structure functions as a microvalve that can control the flow direction of fluids in the microreactor. PACS 42.62.-b; 81.05.Kf; 82.50.Pt 相似文献
6.
Parallel direct laser writing of micro-optical and photonic structures using spatial light modulator
Two-photon polymerization (2PP) is a powerful tool for direct laser writing of micro-optical and photonic structures due to its flexibility in 3D structuring and sub-micrometer resolution. However, it can be time consuming to fabricate arrays of micro-optical devices and complex photonic structures. In this study, we propose to use predefined patterns (PPs) for parallel 2PP processing. A PP contains a multiple focal spot pattern optimized for the fabrication of certain microstructures. PP can be created by holographic laser beam modulation with a spatial light modulator (SLM). The quantity and position of the multiple foci can be flexibly and precisely controlled by predesigned computer generated holograms (CGHs). With these specially designed PPs, parallel fabrication of arbitrary distributed microlens arrays and 3D photonic structures is demonstrated. This method significantly improves throughput and flexibility of the 2PP technique and can be used for mass production of functional devices in micro-optics and photonics. 相似文献
7.
M. Malinauskas A. Žukauskas V. Purlys A. Gaidukevičiu¯tė Z. Balevičius A. Piskarskas C. Fotakis S. Pissadakis D. Gray R. Gadonas M. Vamvakaki M. Farsari 《Optics and Lasers in Engineering》2012,50(12):1785-1788
We present our investigations into the fabrication of three-dimensional microoptical elements by the direct femtosecond laser writing of a germanium–silicon photosensitive hybrid material. Germanium glass composites are very interesting for optical applications as they are photosensitive, and maintain high optical transparency in the visible and near-infrared bands of the spectrum. Here, we have used a germanium containing hybrid material to make nanophotonic structures and microoptical elements such as photonic crystal templates, prisms and spatial polarization plates, both on flat surfaces and fiber tips. Our results show that this germanium silicate composite is an excellent material for microoptics fabrication. 相似文献
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9.
Internal modification of transparent materials such as glass can be carried out using multiphoton absorption induced by a femtosecond (fs) laser. The fs‐laser modification followed by thermal treatment and successive chemical wet etching in a hydrofluoric (HF) acid solution forms three‐dimensional (3D) hollow microstructures embedded in photosensitive glass. This technique is a powerful method for directly fabricating 3D microfluidic structures inside a photosensitive glass microchip. We used fabricated microchips, referred to as a nanoaquarium, for dynamic observations of living microorganisms. In addition, the present technique can also be used to form microoptical components such as micromirrors and microlenses inside the photosensitive glass, since the fabricated structures have optically flat surfaces. The integration of microfluidics and microoptical components in a single glass chip yields biophotonic microchips, in other words, optofluidics, which provide high sensitivity in absorption and fluorescence measurements of small volumes of liquid samples. 相似文献
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