Absorption, photonic crystal

With respect to conventional fiber, the potential benefits of a hollow-core photonic crystal fiber are lower transmission losses (due to both reduced absorption and Raleigh scattering) and lower nonlinearities, since the core is air. In only a few years of research, interest in this area has led to remarkably low-loss fibers (13 dB/km at 1500 mn 100 m length)." With continued advances toward lower-loss photonic crystal fibers, efforts also have begun to address field-level issues, including microbend losses" " and fiber splicing." ... 

Keywords Absorption ARROW waveguide Biosensor Chemical sensor Confinement Dielectrics Evanescent field Fiber optics Fluorescence Hollow core Liquid-core Loss Optical mode Photonic crystal Refractive index Resolution Scattering Sensitivity Total internal reflection Waveguide... 

Collective optical excitations, like surface plasmon-polaritons in partially-ordered metal nanoparticle arrays, tend to be spatially localized. The localization facilitates a giant increase of linear and nonlinear optical responses such as Raman scattering, enhancement of spontaneous emission rate, nonlinear absorption and refraction. In this paper the spectral manifestation of light localization into metal-dielectric nanocomposites i s s tudied i n t he visible. T he e ffect o f t he 1 ateral e lectrodynamic coupling on transmission/reflection optical spectra is investigated for planar silver nanoparticle arrays (random close-packed and polycrystalline quasiregular structures). Combined action of electron and photon confinements is demonstrated experimentally and considered theoretically for ID-photonic crystals consisted of a metal nanoparticle stratified array. 

Tessier PM, Velev OD, Kalambm- AT, Rabolt JF, Lenhoff AM, Kaler EW (2000) Assembly of gold nanostructured films templated by colloidal crystals and use in surface-enhanced Raman spectroscopy. J Am Chem Soc 122 9554 Yan H, Blanford CF, Holland BT, Parent M, Smyrl WH, Stein A (1999) A chemical synthesis of periodic macroporous NiO and metallic Ni. Adv Mater 11 1003 Von Freymann G, John S, Schulz-Dobrick M, Vekris E, Tetreault N, Wong S, Kitaev V, Ozin GA (2004) Tungsten inverse opals The influence of absorption on the photonic band structure in the visible spectral region. Appl Phys Lett 84 224 Denny NR, Han SE, Norris DJ, Stein A (2007) Effects of thermal processes on the structure of monolithic tungsten and tungsten alloy photonic crystals. Chem Mater 19 4563... 

The photophysical properties of these thiol-stabilized particles, such as PL [155] and optically detected magnetic resonance (ODMR) [156], their dispersion in polymer films in order to fabricate light-emitting devices [157-159], their possible use in telecommunication devices [160], further structural properties unraveled by EXAFS (extended X-ray absorption fine structure) [161-165], and their incorporation into photonic crystals [166-168] and silica spheres [169], have been described and in part reviewed in a number of survey reports [144, 145, 170-173]. 

Summary For the preparation of photonic crystals, colloid particles with high refractive indices are formed with diameters from a few nanometers up to several hundred nanometers. Whereas the optical density of Ti02 is already given by the titanium atom itself, the incorporation of dyes in these SiOi systems increases the refractive indices (near the absorption wavelength). The colloid particles are characterized by dynamie and static light scattering, SEM, MAS-NMR, UVA is, and optical transmission/reflection spectroscopy. 

Soboleva fV et al (2005) Second- and third-harmonic generation in birefringent photonic crystals and microcavities based on anisotropic porous silicon. Appl Phys Lett 87(24) 241110-241113 Timoshenko VY et al (2003) Anisotropy of optical absorption in birefiingent porous silicon. Phys Rev B 67(11) 113405... 

T1O2 sol-gel layers, 27 Er-Zr second shell coordinations, 27 ESA. See excited state absorption etching technique, 442 ETU. See energy transfer upconversion Euler s critical stress, 226 europium-activated photonic crystal, 379 europium-doped systems. See also erbium-doped systems aluminum-codoping, 378 electric dipole aspects, 373 FLN spectra, 376 luminescence spectra, 374 magnetic dipole aspects, 373 non-radiative lifetimes, 375 non-radiative transitions, 375 radiative lifetimes, 375 room temperature spectra, 376 silica gels, 376... 

Subramania G., Constant K., Biswas R., Sigalas M.M., Ho K.M. Inverse face-centered cubic thin film photonic crystals. Adv. Mater. 2001 13 443-446 Sun H.B., Matsuo S., Misawa H. Three-dimensional photonic crystal structures achieved with two-photon-absorption photopolymerization of resin. Appl. Phys. Lett. 1999 74 786-788 Sun H.B., Song I., Xu Y., Matsuo S., Misawa H., Du G., Liu S. Growth and property characterizations of photonic crystal structures consisting of colloidal microparticles. J. Opt. Soc. Am. 2000a 17 476-480... 

Sun, H.B., Matsuo, S., and Misawa, H. (1999) Three-dimensional photonic crystal structures achieved with two-photon-absorption photopolymerization of resin. Appl. Phys. Lett., 74 (6), 786-788. 

Over the past few years, nanofabrication through multiphoton absorption has been applied on many sol-gel hybrid organic-inorganic materials photosensitive commercially available hybrids, for instance, have been used to produce 3D photonic crystals and other structures with submicron resolution [87,88]. These materials show a set of properties that are extremely difficult to achieve... 

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