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Numerical Analysis and Comparison of Three Metal-Oxide-Type Super-Resolution Near Field Structures

Chinese Physics Letters 2006年第12期23卷 3363-3365页

作者：瞿青玲王阳干福熹 Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800

Based on the Fresnel-Kirchhoff diffraction theory, we build up a Gaussian diffraction model of metal-oxide-type super-resolution near field structure （super-liENS）, which can describe far field optical properties. The spectral contrast induced by refractive index and the structural changes in AgOg, PtOx and PdOz thin films, which are the key functional layers in super-RENS, are studied by using this model. Comparison results indicate that the spectral contrast depends intensively on the laser-induced distribution and change of the refractive index in the metal-oxide films. The readout mechanism of the metal-oxide-type super-RENS optical disc is further clarified. This Gaussian diffraction model can be used as a simple and effective method for choosing proper active materials in super-RENS.

关键词： OPTICAL-PROPERTIES data-storage MASK LAYER FILMS

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Two-Photon Absorption and Excited State Dynamics of Two Organic Molecules Containing Donor/Acceptor Moieties

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Chinese Physics Letters 2008年第7期25卷 2456-2459页

作者：闫永丽李波刘康俊董志伟马国宏王筱梅钱士雄 Depa. rtment of physics: Fudan University Shang. hai 200433 Surface Physics Lab (National Key Lab) Fudan University Shanghai 200433 Department of Physics Shanghai University. Shanghai 200444 College of Material Science and Engineering Suzhou University Suzhou 215021

Two new two-photon absorption （TPA） molecules, named SK-G1 and NT-G1, are synthesized and the photo- physical characteristics are investigated by using linear absorption spectra, one-photon fluorescence spectra and two-photon excited fluorescence spectra. Both the compounds exhibit TPA properties, and the TPA values determined by z-scan measurement are 10 GM and 39 GM for SK-G1 and NT-G1, respectively, at wavelength 80Ohm. Time-resolved spectroscopic techniques are employed to further explore the excited state dynamics of NT-G l with larger TPA cross section. The research results show that there is an ultrafast intraband energy transfer process （about 3ps） before the formation of charge transfer state with a relatively long lifetime.

关键词： NONLINEAR-OPTICAL PROPERTIES ULTRAFAST DYNAMICS CROSS-SECTIONS LIMITING PROPERTIES data-storage CHROMOPHORES MICROFABRICATION TRIPHENYLAMINE FLUORESCENCE CORE

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Holographic Grating Formation in Cationic Photopolymers with Dark Reaction

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Chinese Physics Letters 2006年第11期23卷 2960-2963页

作者：尉昊赟曹良才 GU Claire 许振丰赫明钊何庆声何树荣金国藩 State Key Laboratory of Precision Measurement Technology and Instruments Tsinghua University Beijing 100084 Department of Electrical Engineering University of California Santa Cruz CA 95064 USA

We propose a new formula to describe the dynamics of holographic grating formation under low intensity pulse exposures in cationic photopolymers, in which the dark reaction contributes dominantly to the grating strength. The formula is based on the living polymerization mechanism and the diffusion-free approximation. The analytical solution indicates that the grating formation time depends on the termination rate constant, while the final grating strength depends linearly on the total exposure energy. These theoretical predictions are verified experimentally using the Aprilis HMC-400μm photopolymer. The results can provide guidelines for the control and optimization of the holographic recording conditions in practical applications.

关键词： data-storage MODEL

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