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Now showing items 1-20 of 515

Experimental Measure Of Dynamic Spatial-hole Burning In DFB Lasers

Phillips Matthew; Darcie Thomas; Flynn E (IEEE-inst Electrical Electronics Engineers Inc, 1992)

We present spatially resolved measurements of carrier density in two 1.3 mum distributed feedback laser diodes. By measuring the response of the spontaneous emission intensity to a 50 MHz drive current we can observe small ...
112 Channel Split-band WDM Lightwave CaATV System

Phillips Matthew; Gnauck Ah; Darcie Te; Frigo Nj; Bodeep Ge; Pitman Ea (IEEE-inst Electrical Electronics Engineers Inc, 1992)

We demonstrate a 1.3 1.55-mu-m wavelength-division-multiplexed analog lightwave system which transports 112 channels (55.25-751.25 MHz) over 10 km of standard single-mode fiber. The lower 60 channels are transmitted by ...
A Model For The Optical-response Of Obliquely Deposited Thin-films

Ditchburn Rj; Smith Geoffrey (Iop Publishing Ltd, 1992)

An effective medium model, capable of explaining both the unusual transmittance characteristics and the pronounced biaxial response observed in obliquely deposited metal and metal-insulator composites, is used to model ...
Theory of equidistant three-dimensional radiance measurements with optical microprobes

Fukshansky-Kazarinova N.; Fukshansky L.; Kuhl Michael; Jã¸Rgensen B. (Optical Society of America, 1996)

Fiber-optic radiance microprobes, increasingly applied for measurements of internal light fields in living tissues, provide three-dimensional radiance distribution solids and radiant energy fluence rates at different depths ...
Low frequency corrections to the static effective dielectric constant of a two-dimensional composite material

Mcphedran Ross; Poulton Christopher; Nicorovici Nicolae; Movchan Alexander (Royal Society, 1996)
General theory of three-dimensional radiance measurements with optical microprobes

Fukshansky-Kazarinova N.; Fukshansky L.; Kuhl Michael; Jã¸Rgensen B. (Optical Society of America, 1997)

Measurements of the radiance distribution and ?uence rate within turbid samples with ?ber-optic radiance microprobes contain a large variable instrumental error caused by the nonuniform directional sensitivity of the ...
Nonlinear Optical Response Of Ge Nanocrystals In A Silica Matrix

Dowd Annette; Elliman Robert; Samoc Marek; Luther-Davies Barry (Amer Inst Physics, 1999)

Time-resolved degenerate-four-wave-mixing measurements were used to study the nonlinear optical response (intensity-dependent refractive index! of Ge nanocrystallites embedded in a silica matrix. Nanocrystals were fabricated ...
Nonlinear Optical Properties Of Semiconducting Nanocrystals In Fused Silica

Dowd Annette; Samoc Marek; Luther-Davies Barry; Elliman Robert (Elsevier Science Bv, 1999)

Degenerate four-wave mixing (DFWM) is used to examine the nonlinear optical response of Ge nanocrystals in a silica matrix. The nanocrystals are formed by implanting 1.0 MeV Ge ions into silica to a dose of 3.0x10(17) Ge ...
Nonlinear field effects in quadrupole mass filters

Schulte Jurgen; Schevschenko P; Radchik Alex (The American Institute of Physics, 1999)

The performance of a quadrupole mass filter (QMF) generally degrades when using electrodes of circular cross section in place of mathematical ideal hyperbolic electrodes. The circular cross section of electrodes produces ...
Eigenvalue problems for doubly periodic elastic structures and phononic band gaps

Poulton Christopher; Movchan Alexander; Mcphedran Ross; Nicorovici Nicolae; Antipov Yuri (Royal Society, 2000)
Non-equilibrium molecular orbital calculations of Si/SiO2 Interfaces

Schulte Jurgen; Ushio J; Maruizumi Takuya (Elsevier Inc, 2000)

A non-equilibrium statistical molecular orbital approach has been developed to analyze non-equilibrium configurations in Si/SiO2 heterostructures, improvement of which is essential for realization of superior semiconductor ...
Physical and optical characterisation of Ge-implanted silica

Dowd Annette; Llewellyn David; Elliman Robert; Luther-Davies Barry; Samoc Marek; Fitz Gerald John (Elsevier Inc, 2001)

Ge nanocrystals formed in silica by implantation with 1.0 MeV Ge ions and subsequent annealing at 1100Â°C were characterised by transmission electron microscopy and Raman spectroscopy. The nanocrystals were found to be ...
Linear optical properties of Ge nanocrystals in silica

Dowd Annette; Elliman Robert; Luther-Davies Barry (American Institute of Physics, 2001)

The absorption and extinction spectra of Ge nanocrystals in silica formed by ion implantation are studied using photothermal deflection and transmission spectroscopies. It is found that scattering makes a significant ...
Direct nanoengineering and lithographic patterning of optically anisotropic thin films

Hodgkinson Ian; Wu Qi; Arnold Matthew; Blaikie Richard (Elsevier, 2001)

Biaxial and chiral thin films formed by oblique vapour deposition are patterned using standard photolithography. In one example 5 ?m wide half-wave plates are fabricated by reactive ion etching a biaxial silicon film.
XPS and AFM surface studies of solvent-cast PS/PMMA blends

Ton-That Cuong; Shard Alex; Teare D.; Bradley R. (Elsevier Ltd, 2001)

Films of polystyrene (PS) and poly(methyl methacrylate) (PMMA) blends of two different thicknesses have been examined by X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). Blends with different ...
Fresnel Formulation For Multi-element Lamellar Diffraction Gratings In Conical Mountings

Camnpbell S; Botten Lindsay; De Sterke C; Mcphedran Ross (Taylor and Francis, 2001)
Non-Rigid Image Registation Using a Median-Filetered Coarse-to-Fine Displacement Field and a Symmetric Correlation Ratio

Lau Yiu; Braun Michael; Hutton Brian (Institute of Physics Publishing, 2001)

Conventional approaches to image registration are generally limited to imagewide rigid transformations. However, the body and its internal organs are non-rigid structures that change shape due to changes in the body's ...
Calculations of Air-Guided Modes in Photonic Crystal Fibres Using the Multipole Method

White Thomas; Mcphedran Ross; Botten Lindsay; Smith Geoff; De Sterke C (Optical Society of America, 2001)

We demonstrate that a combination of multipole and Bloch methods is well suited for calculating the modes of air core photonic crystal fibers. This includes determining the reflective properties of the cladding, which ...
Depth-Resolved Cathodoluminescence Microanalysis of Near-Edge Emission in Ill-Nitride Thin Films

Gelhausen Olaf; Phillips Matthew; Toth Milos (American Institute of Physics, 2001)

We describe an approach to assess the quality of III-nitride thin films using depth-resolved cathodoluminescence (CL) microanalysis. In this procedure, the depth-resolved peak shift due to self-absorption of the near-edge ...
Cathodoluminescence Studies of Self-Organised CdTe/ZnTe Quantum Dot Structure Grown by MBE: In-Plane and In-Depth Properties of the System

Godlewski Marek; Mackowski Sebastien; Karczewski Grzegorz; Goldys Ewa; Phillips Matthew (Institute of Physics, 2001)

We report the results of low-temperature photoluminescence, room-temperature cathodoluminescence (CL) and scanning CL and electron microscopy of self-organized CdTe/ZnTe quantum dot (QD) structure. The in-depth profiling ...

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