Photopolymer-based photonic crystals with bandgaps in the near infrared region
TL;DRAbstract
Near infrared photonic crystals were generated by two-photon photopolymerization of urethane acrylate monomers and oligomers in a commercial UV-absorbing resin (SCR500, Japan Synthetic Rubber Co. Ltd.), followed by a washout of the unpolymerized material using Ethanol. We fabricated woodpile structures consisting of 40 layers spaced at 350-500 nm with a lateral size of 60-65 x 60-70 micrometers. Adjacent layers were oriented perpendicularly. Corresponding layers were displaced by half the in-plane period of 1.25-1.5 micrometers. The structures were produced using 0.5-1.1 mW femtosecond pulsed 540 nm light from a Ti:Sapphire laser combined with an optical parametric oscillator with an intra-cavity frequency doubler. Scan speeds were chosen between 30 and 90 microns/s. Ellipsoidal rods with 200-300 nm lateral and 600-900 nm axial diameters acted as basic structural elements. The ratio of 3.1 between the diameters reflects the two-photon point-spread function for our Zeiss 40x NA 1.3 obje
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Near infrared photonic crystals were generated by two-photon photopolymerization of urethane acrylate monomers and oligomers in a commercial UV-absorbing resin (SCR500, Japan Synthetic Rubber Co. Ltd.), followed by a washout of the unpolymerized material using Ethanol. We fabricated woodpile structures consisting of 40 layers spaced at 350-500 nm with a lateral size of 60-65 x 60-70 micrometers. Adjacent layers were oriented perpendicularly. Corresponding layers were displaced by half the in-plane period of 1.25-1.5 micrometers. The structures were produced using 0.5-1.1 mW femtosecond pulsed 540 nm light from a Ti:Sapphire laser combined with an optical parametric oscillator with an intra-cavity frequency doubler. Scan speeds were chosen between 30 and 90 microns/s. Ellipsoidal rods with 200-300 nm lateral and 600-900 nm axial diameters acted as basic structural elements. The ratio of 3.1 between the diameters reflects the two-photon point-spread function for our Zeiss 40x NA 1.3 obje
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