Browsing Physics (Scholarly Publications) by Author "Hegarty, John"
Now showing items 1-5 of 5
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Collisional Broadening of Semiconductor Microcavity Polaritons
Donegan, John; Bradley, Louise; Hegarty, John (2002)We measure the effect of intensity on the homogeneous linewidth of two high finesse semiconductor microcavities in the strong coupling regime using degenerate four‐wave mixing. We find that the collisional broadening due ... -
Epitaxial lift-off of ZnSe based II-VI structures
Bradley, Louise; Hegarty, John (1995)The epitaxial lift-off technique is applied to II?VI based structures. Epilayers of 255 nm thickness containing quantum wells are lifted off their substrates and redeposited onto polyimide coated GaAs. The technique has ... -
Nonlinear reflectivity of semiconductor microcavities in the weak- and strong-coupling regimes: Experiment and theory
Bradley, Louise; Hegarty, John (1998)We use an entirely classical model to describe the nonlinear properties of semiconductor microcavities in both the weak- and strong-coupling regimes, as measured in a series of spectrally and temporally resolved pump-probe ... -
Nonlinear reflectivity of strongly coupled exciton-photon systems under resonant and non-resonant pumping
Bradley, Louise; Hegarty, John (2000)Coupled exciton–photon systems are investigated using the pump–probe technique in order to gain a better understanding of the important mechanisms governing cavity–polariton nonlinear behaviour and dynamics. A semi-classical ... -
Two-photon induced photoconductivity enhancement in semiconductor microcavities: a theoretical investigation
Bradley, Louise; Donegan, John; Hegarty, John (2002)We describe a detailed theoretical investigation of two-photon absorption photoconductivity in semiconductor microcavities. We show that high enhancement (by a factor of >10,000) of the nonlinear response can be obtained ...