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2011 International Quantum Electronics Conference (IQEC) and Conference on Lasers and Electro-Optics (CLEO) Pacific Rim incorporating the Australasian Conference on Optics, Lasers and Spectroscopy and the Australian Conference on Optical Fibre Technology
Recent developments in astrophotonics herald a new era for ground-based astronomy. These technologies are now being extended and adapted to space-borne instrumentation over the coming decade. One of the revolutionary developments is the photonic integrated multimode microspectrograph (PIMMS) that greatly reduces the size of any spectrograph, independent of the telescope aperture, the slit aperture...
We observed the Purcell effect in a three-dimensional photonic crystal nanocavity with a single quantum dot. The enhancement and suppression factors of the spontaneous emission rate are ∼2 and 1.6, respectively.
We consider discrete diffraction in coupled photonic crystal waveguides in a hexagonal lattice. We show that in these structures the (discrete) diffraction coefficient depends strongly on frequency and can even change sign. This behavior does not occur in photonic crystal waveguides in square lattices. This behavior is interesting in its own right and has intriguing consequences for the propagation...
We have developed a three-dimensional vectorial finite element method (FEM) program which offers the flexibility to model 3D diffraction gratings with arbitrary geometry. The FEM satisfies the energy conservation relation and allows us to analyze periodic structures such as photonic crystals and metamaterials.
We propose three types of III-V/Si hybrid laser structures utilizing conductive wafer-bonded III-V/Si heterointerfaces. Our structures enable vertical current injection across the bonded heterinterfaces and therefore have advantages of lateral current confinement leading to higher quantum efficiencies and simpler fabrication without mesa etch or ion implantation in contrast to the previous lateral-current-injection...
We present a tunable MEMS-VCSEL operating around 850 nm wavelength with the highest reported continuous tuning range of 37 nm achieved with semiconductor DBRs. The electro thermal tuning speed of the device reaches 700 Hz.
Nonequilibrium steady states of single-mode laser operations are determined based on a many-body model for semiconductor microcavities above the lasing threshold. The physics of gain saturation is taken into account, and the kinetic hole burning is found for the distribution functions of carriers whose position in the momentum space depends on the carrier temperatures. Since the Coulomb enhancement...
AlGalnAs/InP hexagonal resonator microlasers are fabricated using standard photolithography and ICP etching process. Room temperature continuous-wave electrically injected operation is realized for the hexagon microlasers with an output waveguide connected to one vertex. Single mode operation is achieved with the side mode suppression ratio up to 25 dB for a hexagon microlaser with the edge length...
Dynamics of Er-doped ultrashort pulse fiber laser with single wall carbon nanotube polyimide film were investigated both experimentally and numerically. Dependence on output coupling ratio, temporal response of nanotube, and dispersion properties were discussed.
Graphene epitaxially grown on 6H-SiC substrates by thermal decomposition was used as saturable absorbers for mode-locking of ytterbium-doped fiber lasers. Stable picosecond 19 nJ pulse centered at 1035 nm was generated at 1.05 MHz repetition rate.
We demonstrated harmonically mode-locked soliton laser based on evanescent field interaction of carbon-nanotube saturable absorbers. The repetition rate was 943 MHz at 34th harmonics with super-mode suppression of 60 dB at 18 mW output power.
We demonstrate a novel bidirectional fiber laser mode-locked with two semiconductor saturable absorber mirrors (SESAMs) incorporated into the laser cavity through a four-port circulator. The laser allows the generation of two independent countercirculating mode-locked pulse trains, each with individual fundamental repetition. In the experiment, two countercirculating pulse trains, with repetition...
Stationary Inflection Points (SIPs) around a frequency ω0 are of the form ω-ω0 ∝ km for any positive odd integer. We show theoretically that SIPs of order m can be created in optical waveguides such as optical fiber gratings or periodic nanobeam waveguides by coupling between m modes. Remarkably, we find that at the SIP frequency significant incident energy can be coupled into the waveguide even though...
We study surface waves in two-dimensional modulated photonic lattices and demonstrate that, in a sharp contrast to one-dimensional lattices where localized surface modes can exist, the radiation escapes along the boundaries of the two-dimensional structure.
An ultra-broadband high-efficiency grating coupler has been designed for the +1 diffraction order at an operating wavelength of 1.55μm for TM polarization in horizontal slot waveguide. The coupling bandwidth is significantly increased by properly raising the height of unperturbed silicon ridges, meanwhile the coupling efficiency is also enhanced. The 1dB bandwidth is 70nm which doubles the previously...
A simple phase-based technique is presented for the analysis and design of binary layered optical media operating at effective refractive indices below the lowest index of the layers — relevant for devices such as hollow-core Bragg fiber and on-chip waveguides, radial Bragg resonators, VCSEL cavities, multilayer mirrors or antireflection coatings. For a given binary stack of layers, the phase accumulation...
A faster method of simulating 2D slabs, both metallic and dielectric, with cylindrical inclusions is proposed. The method is applicable to photonic crystal defect-row waveguides and extraordinary transmssion through metallic films, capable of producing both in-plane dispersion relations and transmission spectra.
A pressing need exists for optically-path-length-matched waveguides in monolithic integrated photonics for applications such as high angular resolution optical stellar interferometry. In this paper, we discuss techniques for rapid prototyping of physically-path-length-matched three-dimensional photonic circuitry.
The ultrashort pulsed near-infrared femtosecond laser has had a large impact in biomedical research fields and in microscopy, where it has enabled new imaging methodologies. At high intensities, the focused beam of a femtosecond laser has been used to irradiate specific locations inside a cell, often beneath the cell membrane, exploiting the inherent penetration and localized absorption that comes...
We present a practical implementation of single-molecule based localisation microscopy by combining single laser line excitation and use of conventional dyes. We investigate the organization of membrane proteins into clusters in cardiac and neuronal cells.
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