Articles you may be interested in Temperature modulation molecularbeam epitaxy and its application to the growth of periodic index separate confinement heterostructure InGaAs quantumwell lasers Periodic index separate confinement heterostructure InGaAs/AlGaAs multiple quantum well laser grown by organometallic vapor phase epitaxy Appl. Very low threshold single quantum well gradedindex separate...

A model for quantitative analysis of microdisk laser emission spectra is presented. Conformal mapping is used to determine radial and azimuthal eigenvalues, eigenvectors, and cavity Q corresponding to leaky optical resonances in an optically transparent dielectric disk. The effects of gain and loss in a microcavity active medium are also included in the model. Our results compare well with expe...

Analytical expressions are derived which relate the optical bandwidth and the fabrication tolerances of multimode interference (MMI) couplers to their most important design parameters. These expressions compare adequately with mode analysis simulations. For strong guided structures, the optical bandwidth is shown to be inversely proportional to the number of input and output ports N and to the ...

Using a newly developed InP/InGaAsP multichannel detector, we developed a near-infrared Raman spectroscopic system that can measure human tissues efficiently without interference from fluorescence. This enabled us to measure an in vivo Raman spectrum of live human tissue (skin) in 1 min using fiber probe optics. By applying this system to human lung tissues, we found that Raman spectroscopy mak...

We demonstrate a chip-scale compact optical curvature sensor. It consists of a low threshold InGaAsP microdisk laser on a flexible polydimethylsiloxane polymer substrate. The curvature dependence of lasing wavelength was characterized by bending the cavity at different bending radii. The measurements showed that the lasing wavelength decreases monotonously with an increasing bending curvature. ...

The metalorganic chemical vapor deposition of a highly strained InGaAsN quantum-well ~QW! surrounded by ~In!GaAsP direct barrier layers is investigated. We found that growth pause annealing with AsH3 , performed immediately before and after the growth of the QW, significantly improves the optical quality of InGaAsN QW with ~In!GaAsP direct barriers. The utilization of larger band gap barrier ma...

An InGaAsP-InP optical switch geometry based on electrical control of waveguide-resonator coupling is demonstrated. Thermooptic tuning of a Mach-Zehnder interferometer integrated with a racetrack resonator is shown to result in switching with ON-OFF contrast up to 18.5 dB. The optical characteristics of this unique design enable a substantial reduction of the switching power, to a value of 26 m...

Because multiple simultaneous reflection ofx rays is very sensitive to lattice deformation, the sixbeam, (000) (006) (224) (222) (224) (222) multiple reflection was used to record simultaneously the information about the lattice mismatch of[ool] InGaAsP materials using a divergent x-ray source. The lattice mismatches in directions parallel and perpendicular to [001], determined from a single di...

Design of passive ring-coupled lasers based on InGaAsP waveguides is investigated using beam propagation method. Mode coupling, propagation loss due to bending, and scattering loss from waveguide sidewall roughness are taken into account. By compromising threshold gain, linewidth and side-mode suppression ratio (SMSR), suitable waveguide width and coupling strength are determined for different ...

We propose and analyze a new photonic crystal cavity design that supports a dipole mode with a quality factor greater than 20,000. Such a high quality factor is obtained by precise tuning of the cavity length with minimal disruption of the surrounding photonic crystal. A fabrication procedure based on dry etching of InGaAsP material in HI/H2/Ar is used to demonstrate photonic crystal lasers wit...