The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
We report high transmission through SiC films when a two-dimensional periodic arrangement of subwavelength cylindrical holes is made. We attribute the near-perfect transmission peak inside the polariton gap of SiC to propagating waveguide modes.
A nonlinear index guiding silica PCF is optimized for efficient second harmonic generation through dispersion calculations zero group velocity mismatch is possible for any pump wavelength above 80 nm. Very high conversion efficiencies and bandwidths are found.
A simple optical arrangement for phase sensitive detection of DFWM to characterize the real and imaginary parts of chi(3) is demonstrated. A processable polyacetylene sample is characterized at a wavelength of 1.5 mu(3)m using this technique.
We demonstrate a 20-mum-radius disk resonator based on Si/SiO2 slot-waveguide. Quality factors around 1,000 are measured. Low effective refractive index evidences light guiding in the low index SiO2 layer.
A planar-waveguide quasi-phase matched second-harmonic generation device, which consists of a Y-cut periodically poled MgO-doped LiNbO3 core and SiO2 claddings, provides 1-W green light with 30-% conversion efficiency at room temperature.
850 nm AlGaAs-based VCSELs with sub-micron hole arrays on the top of the DBR mirror are presented. The VCSEL exhibits lower threshold current down to 0.5 mA with enhanced optical output power by surface plasmon resonance at the Ag/SiO2 interface consisting the sub-micron metal hole arrays.
We present a novel and simple method of producing small core silica holey fibres with nonlinearity close to the maximum achievable. An effective area of 1.6 mum2 with a loss of 0.18 dB/m at 1.55 mum were achieved.
Long-range periodic nanoplane gratings written inside fused silica using a focused femtosecond laser beam can be erased and replaced with new gratings whose orientation is determined by the polarization of the femtosecond laser overwrite beam.
One-step femtosecond laser writing is used to make nanoporous capillaries inside fused silica. Laser-induced dye fluorescence shows penetration over millimeters. Fluid flow can be controlled through the porosity dependence on the laser writing parameters.
We demonstrate the formation of long period gratings in fluid-filled photonic bandgap fiber (PBGF). The unique modal properties of PBGFs allow for coupling to LP11-like modes at multiple wavelengths. We obtain good agreement with simulations.
We report on the observation of electromagnetically induced transparency using the hyperfine levels of Er3+:Y2SiO5 crystal and on hole burning spectroscopy in order to identify the Lambda-like three-level system over the inhomogeneously broadened distribution.
We demonstrate the design and fabrication of optically pumped sub-diffraction nanophotonic waveguides using a self assembly process to attach two different types of quantum dots on a silicon dioxide substrate, thus enabling low crosstalk.
A 740nm electro-luminescent ITO/SiOx/p-Si/Al MOS diode with Si nano-pyramids synthesized at SiOx/Si interface is demonstrated with turn-on voltage, threshold current, output power, and lifetime of 50 V, 1.23 mA/cm2, 30 nW, and 10 hrs, respectively.
Ultraviolet light was detected by MOS devices with silicon nanocrystals-embedded mesoporous silica sensing layers. The detector reveals high photoresponse of 2.0 (0.3) A/W at wavelength 370 (275) nm, and is blind to green light.
A new domain of rapid waveguide writing using 50 to 1500 fs laser pulses is presented for fused silica. Type II photosensitivity mechanisms are inferred for the low-loss waveguides, imprinted with coarsely overlapping pulses.
Single-maximum nondiffracting beams were generated both, by truncating pulsed Bessel beams and with thin-film axicons. Negligible crosstalk is observed in arrays of needle-shaped beams over substantial distances, enabling applications in pulse diagnostics and multichannel processing.
We present a LiNbO3 disk resonator with a SiO2 cladding layer and proximate electrodes fabricated on a flexible substrate. A tunable optical filter based on whispering gallery modes is demonstrated using the resonator.
Optical silicon carbide is proposed for face cooling in bulk solid-state lasers instead of currently used diamond. First demonstrations resulted in 24% slope efficiency of the SiC-cooled Nd:YAG laser despite double SiC/YAG interface intracavity loss.
Waveguides were fabricated in fused silica using kHz and MHz repetition rate femtosecond lasers. Raman and fluorescence microscopy showed increases in 3-membered rings for both cases and fewer NBOHC-defects when writing with the MHz laser.
We have designed a compact solid compressor by stimulated Brillouin scattering used in a fused silica glass. An 13 ns Nd:YAG laser pulse has been temporally compressed to a 1.2 ns pulse at 1064 nm.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.