• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 1
  • Tagged with
  • 635
  • 110
  • 96
  • 79
  • 78
  • 78
  • 74
  • 74
  • 74
  • 65
  • 34
  • 27
  • 21
  • 18
  • 13
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
111

Pulsed imaging and spectroscopy using on-chip THz waveguides

Byrne, Matthew Benjamin January 2008 (has links)
No description available.
112

The development of terahertz spectroscopy systems based on Fe-InGaAs and Fe-InGaAsP photoconductive materials

Hatem, Osama Elsayed Abdelrazik January 2011 (has links)
No description available.
113

Photonic Cavities tor Liglit-Matter Interaction at the Nanometre Scale

Lam, Sang January 2009 (has links)
No description available.
114

Infrared detection and spectral imaging using low strain quantum mdot infrared photodetectors

Vines, Peter January 2010 (has links)
No description available.
115

A1InGaN based materials and devices for optoelectronics

Ranalli, Fabio January 2011 (has links)
In this work the optimisation of metal contacts to Ill-nitrides will be analysed together with the optical and optoelectronic properties of AlIllGaN /GaN epistructures and devices. The activation of p-Ca : was optimized by varying the annealing temperature, time and the mixture of flowing gases. Around 850°C the sheet resistance reached the lowest value and the dissociation energy of the Mg-H complex was calculated to be 3.65 eV. Surface treatment for the removal of native oxide and impurities from the surface of p-GaN was considered. When treated with HF and, prior to metal deposition, HCI the lowest value for the specific contact resistivity and the contact resistance were found. 4.45 x 10-4 Ώcm2 and 142Ώ. respectively. From this data the concentration of free carriers was estimated to 1017cm-3. The technique commonly used to characterize ohmic contacts to semiconductors, based on the Circular Transmission Lino Model, has been analysed. When applied to semiconductors with large sheet resistance the technique proved to be not sensitive enough to provide reliable data for low specific resistivity contacts. The growth of InGaN/GaN mqw epilayers has been optimized to generate a strong luminescence at about 420 run. Laser structures were grown. The processing of blue/violet LDs has been analysed. Etching of the ridge and the mesa can affect the conductivity of the p-region and the quality of the contacts. Exposure of the conductivity to plasma was found to introduce significant damage and to lower the quality of the contacts. Superlurniuescent devices w« re processed which showed no lasing. Samples from the same material and processed elsewhere were characterized. Lasing was recorded from these devices with a threshold current density of 16 kAcm-2 at 424mm The growth of AllllGaN/AlInGaN \IQ\V epilayers was optimized. Growth temperature and pressure were found to affect both the incorporation of Al and In and the crystal quality. Strain relaxation in MQW was found to degrade the optical per- formance with respect to SQV· UV-LEDs were processed, emitting at 350 nm, which produced bright luminescence.
116

Characterisation of Quantum dot infared photodetectors and modelling of In0.52Al0.48aS lINEAR AND gEIGER Mode Avalanche Photodiodes

Mun, Souye-Cheong Liew Tat January 2008 (has links)
No description available.
117

Surface plasmon-polariton mediated emission of light through thin metal films

Wedge, Stephen January 2004 (has links)
No description available.
118

Grating coupled surface plasmons in metallic structures

Chen, Zhuo January 2007 (has links)
No description available.
119

Theoretical and practical investigation of the switching in liquid crystal filled polymer structure devices

Coulston, Stephen James January 2004 (has links)
No description available.
120

Technologies for large scale manufacture of integrated optical transmitters and receivers

Chown, D. P. M. January 1994 (has links)
No description available.

Page generated in 0.0169 seconds