http://www.sciencearchived.com Science News, Articles and Vacancies Wed, 20 Aug 2008 01:18:46 +0000 http://backend.userland.com/rss092 en Thermal poling was utilized to induce second-order nonlinearity in regions of fused silica modified by 771 nm femtosecond laser pulses. With second-harmonic microscopy, it was found that the nonlinearity in the laser-modified region was much lower than that in nonmodified regions. This is attributed ... [Appl. Phys. Lett. 93, 061115 (2008)] published Fri Aug 15, 2008.]]> http://www.sciencearchived.com/thermal-poling-induced-second-order-nonlinearity-in-femtosecond-laser-modified-fused-silica/ We fabricate a nanotube-polyvinyl alcohol saturable absorber with a broad absorption at 1.6 [mu]m. We demonstrate a pulsed fiber laser working in the telecommunication L band by using this composite as a mode locker. This gives ~49816 fs pulses at 1601 nm with a 26.7 MHz repetition rate. ... [Appl. Phys. Lett. 93, 061114 (2008)] published Fri Aug 15, 2008.]]> http://www.sciencearchived.com/l-band-ultrafast-fiber-laser-mode-locked-by-carbon-nanotubes/ By using a single-beam optical interference lithography we fabricated a kind of periodic complex photonic crystals constructed with a portion of photonic quasicrystals. The periodic photonic crystals show the photonic bandgap properties of the original photonic quasicrystals but maintain the periodi ... [Appl. Phys. Lett. 93, 061112 (2008)] published Thu Aug 14, 2008.]]> http://www.sciencearchived.com/fabrication-of-periodic-complex-photonic-crystals-constructed-with-a-portion-of-photonic-quasicrystals-by-interference-lithography/ We report on very effective stabilization of porous silicon optical devices through a chemical surface modification technique. Such a chemical treatment proves to alter the growth of native silicon oxide on pore surfaces and thus prevents the optical device from chemical aging. As an example, we app ... [Appl. Phys. Lett. 93, 061113 (2008)] published Thu Aug 14, 2008.]]> http://www.sciencearchived.com/stabilized-porous-silicon-optical-superlattices-with-controlled-surface-passivation/ We report on dynamics of ultraviolet (UV) emissions using above band gap excitation in Tm-doped AlN epilayers grown by solid-source molecular beam epitaxy. The UV and visible photoluminescence (PL) spectra were measured using the frequency quadrupled output from a Ti:sapphire laser. In the UV region ... [Appl. Phys. Lett. 93, 061110 (2008)] published Thu Aug 14, 2008.]]> http://www.sciencearchived.com/dynamics-of-ultraviolet-emissions-in-tm-doped-aln-using-above-band-gap-excitation/ We report the results of our experimental investigation of laser induced gold nanoparticle gratings and their optical diffraction properties. A single shot of a pair Nd-YAG laser pulses with the same polarization is directed toward a 6 nm thick gold film on a substrate of polymethyl methacrylate. As ... [Appl. Phys. Lett. 93, 061109 (2008)] published Thu Aug 14, 2008.]]> http://www.sciencearchived.com/laser-pulse-induced-gold-nanoparticle-gratings/ We show full three-dimensional electrical and optical simulation of a tunable silicon-based photonic crystal chromatic dispersion compensator with high power efficiency and ultralow power consumption (114 nW), operating at a speed of 40.5 MHz. The device exploits a structure where the optical field ... [Appl. Phys. Lett. 93, 061111 (2008)] published Thu Aug 14, 2008.]]> http://www.sciencearchived.com/electrically-controlled-silicon-based-photonic-crystal-chromatic-dispersion-compensator-with-ultralow-power-consumption/ The spatial distribution of surface electromagnetic waves on a one-dimensional photonic crystal with a polymeric grating on top is mapped using a multiheterodyne scanning near-field optical microscope. The grating opens a bandgap. At the band edges, a stationary field formed by two surface waves wit ... [Appl. Phys. Lett. 93, 061108 (2008)] published Thu Aug 14, 2008.]]> http://www.sciencearchived.com/near-field-analysis-of-surface-electromagnetic-waves-in-the-bandgap-region-of-a-polymeric-grating-written-on-a-one-dimensional-photonic-crystal/ http://www.sciencearchived.com/simulation-techniques-enhance-cellular-nanobioimaging/ http://www.sciencearchived.com/see-you-again-in-22000-years/