Title :
The nonlinear absorption and phase recovery of quantum dot based reverse-biased waveguide electro-absorbers
Author :
Piwonski, T. ; Pulka, J. ; Madden, G. ; Houlihan, J. ; Huyet, G. ; Viktorov, E.A. ; Erneux, T. ; Mandel, P.
Author_Institution :
Tyndall Nat. Inst., Cork, Ireland
Abstract :
The physics of quantum dot based optical devices has been studied intensively due to their interesting blend of atomic and solid state properties. Recently, attention has been focused on their absorption properties and has led to QD materials finding favour in such applications as monolithic mode-locked lasers, electro-absorption modulators and saturable absorber mirrors. In this study we perform a detailed experimental investigation of the ultrafast absorption and phase dynamics of a QD InAs/GaAs structure under reverse bias conditions using single colour pump-probe measurements. Experimental results reveal the fundamental timescales and underlying dynamical processes occurring in such absorbers. We will also consider the impact of the observed absorption and phase dynamics on some current applications of QD absorbers.
Keywords :
III-V semiconductors; gallium arsenide; high-speed optical techniques; indium compounds; optical saturable absorption; optical waveguides; quantum dots; InAs-GaAs; fundamental timescales; nonlinear absorption; phase recovery; quantum dot; reverse biased waveguide electro-absorbers; single colour pump probe measurement; ultrafast absorption; Absorption; Atom optics; Atomic beams; Optical devices; Optical materials; Optical waveguides; Physics; Quantum dot lasers; Quantum dots; Solid state circuits; Quantum dot; absorption recovery dynamics; pump-probe spectroscopy; semiconductor electro-absorbers;
Conference_Titel :
Transparent Optical Networks (ICTON), 2010 12th International Conference on
Conference_Location :
Munich
Print_ISBN :
978-1-4244-7799-9
Electronic_ISBN :
978-1-4244-7797-5
DOI :
10.1109/ICTON.2010.5549021
