We employ an aluminum (Al) film as a thermal conduction layer under the laser thermal lithography AgInSbTe phase-change film to improve the patterning resolution in laser thermal lithography.The patterns were fabricat...We employ an aluminum (Al) film as a thermal conduction layer under the laser thermal lithography AgInSbTe phase-change film to improve the patterning resolution in laser thermal lithography.The patterns were fabricated by laser writing and wet-etching.The laser writing was conducted by a setup where the laser wavelength and the numerical aperture of the converging lens were 405nm and 0.90,respectively.The wet-etching was carried out in a 17wt% ammonium sulfide solution.Experimental results indicate that the patterning resolution enhancement induced by an Al thermal conduction layer is more than 20% compared with that of the samples without an Al thermal conduction layer.The analysis reveals that the resolution-enhancing effect may be due to the changes of heat diffusion directions induced by the Al thermal conduction layer.展开更多
Two novel anthracene derivatives containing 4-vinylpyridine （FPEA） and 2-vinylpyridine （TPEA） poly（methyl methacrylate） films are prepared on quartz glass substrates. Their nonlinear absorption properties are in...Two novel anthracene derivatives containing 4-vinylpyridine （FPEA） and 2-vinylpyridine （TPEA） poly（methyl methacrylate） films are prepared on quartz glass substrates. Their nonlinear absorption properties are investigated by using a 120-fs, 800-nm Ti：sapphire femtosecond pulsed laser operating at a 1-kHz repetition rate. The unique nonlinear absorption properties of these new compounds are observed by utilizing a Z-scan system. These two-photon absorption （TPA） properties are proven by the two-photon fluorescence excited at 800 nm. The FPEA and TPEA films have nonlinear TPA coefficients of 0.164 and 0.148 cm/GW and the TPA cross sections of 3.345 × 10^-48 and 3.081 × 10^-48 cm4 ·s/photon, respectively. The influence of the chemical structures on the nonlinear TPA properties of the compounds is also discussed. The highly nonlinear TPA activities of the films implied that the new anthracene derivatives are suitable materials with promising applications in super-high-density three-dimensional data storage and nano- or microstructure fabrication.展开更多
Antimony-based bismuth-doped thin film, a new kind of super-resolution mask layer, is prepared by magnetron sputtering. The structures and optical constants of the thin films before and after annealing axe examined in...Antimony-based bismuth-doped thin film, a new kind of super-resolution mask layer, is prepared by magnetron sputtering. The structures and optical constants of the thin films before and after annealing axe examined in detail. The as-deposited film is mainly in an amorphous state. After annealing at 170- 370 ℃, it is converted to the rhombohedral-type of structure. The extent of crystallization increased with the annealing temperature. When the thin film is annealed, its refractive index decreased in the most visible region, whereas the extinction coefficient and reflectivity are markedly increased. The results indicate that the optical parameters of the film strongly depend on its microstructure and the bonding of the atoms.展开更多
We report on a novel dibenzothiophene-based two-photon fluorescent probe for selective nuclear bioimaging,which contains bilaterally symmetrical pyridine rings connected by a central conjugated-bridge dibenzothiophene...We report on a novel dibenzothiophene-based two-photon fluorescent probe for selective nuclear bioimaging,which contains bilaterally symmetrical pyridine rings connected by a central conjugated-bridge dibenzothiophene. This probe possesses a large two-photon absorption cross-section of 471 GM, yields a 25-fold enhancement of the fluorescence titration, and a stronger photostability for nuclei labeling than existing probes. The real-time observation period is a minimum of 1800 s under a femtosecond laser excitation, which is significantly longer than that of 40,6-diamidino-2-phenylindole. The above results confirm that this novel molecule is a suitable two-photon fluorescent probe for application to nuclear bioimaging in cells.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos 61137002 and 61178059.
文摘We employ an aluminum (Al) film as a thermal conduction layer under the laser thermal lithography AgInSbTe phase-change film to improve the patterning resolution in laser thermal lithography.The patterns were fabricated by laser writing and wet-etching.The laser writing was conducted by a setup where the laser wavelength and the numerical aperture of the converging lens were 405nm and 0.90,respectively.The wet-etching was carried out in a 17wt% ammonium sulfide solution.Experimental results indicate that the patterning resolution enhancement induced by an Al thermal conduction layer is more than 20% compared with that of the samples without an Al thermal conduction layer.The analysis reveals that the resolution-enhancing effect may be due to the changes of heat diffusion directions induced by the Al thermal conduction layer.
基金supported by the National Natural Science Foundation of China under Grant Nos. 61137002 and 50872139
文摘Two novel anthracene derivatives containing 4-vinylpyridine （FPEA） and 2-vinylpyridine （TPEA） poly（methyl methacrylate） films are prepared on quartz glass substrates. Their nonlinear absorption properties are investigated by using a 120-fs, 800-nm Ti：sapphire femtosecond pulsed laser operating at a 1-kHz repetition rate. The unique nonlinear absorption properties of these new compounds are observed by utilizing a Z-scan system. These two-photon absorption （TPA） properties are proven by the two-photon fluorescence excited at 800 nm. The FPEA and TPEA films have nonlinear TPA coefficients of 0.164 and 0.148 cm/GW and the TPA cross sections of 3.345 × 10^-48 and 3.081 × 10^-48 cm4 ·s/photon, respectively. The influence of the chemical structures on the nonlinear TPA properties of the compounds is also discussed. The highly nonlinear TPA activities of the films implied that the new anthracene derivatives are suitable materials with promising applications in super-high-density three-dimensional data storage and nano- or microstructure fabrication.
基金supported by the National Basic Research Program of China (No. 2007CB935402)the National Natural Science Foundation of China(Nos. 50872139 and 60644002)
文摘Antimony-based bismuth-doped thin film, a new kind of super-resolution mask layer, is prepared by magnetron sputtering. The structures and optical constants of the thin films before and after annealing axe examined in detail. The as-deposited film is mainly in an amorphous state. After annealing at 170- 370 ℃, it is converted to the rhombohedral-type of structure. The extent of crystallization increased with the annealing temperature. When the thin film is annealed, its refractive index decreased in the most visible region, whereas the extinction coefficient and reflectivity are markedly increased. The results indicate that the optical parameters of the film strongly depend on its microstructure and the bonding of the atoms.
基金supported by the National Natural Science Foundation of China under Grant Nos.61137002,61178059,and 51172253
文摘We report on a novel dibenzothiophene-based two-photon fluorescent probe for selective nuclear bioimaging,which contains bilaterally symmetrical pyridine rings connected by a central conjugated-bridge dibenzothiophene. This probe possesses a large two-photon absorption cross-section of 471 GM, yields a 25-fold enhancement of the fluorescence titration, and a stronger photostability for nuclei labeling than existing probes. The real-time observation period is a minimum of 1800 s under a femtosecond laser excitation, which is significantly longer than that of 40,6-diamidino-2-phenylindole. The above results confirm that this novel molecule is a suitable two-photon fluorescent probe for application to nuclear bioimaging in cells.
