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HL: Fachverband Halbleiterphysik

HL 43: Quantum dots and wires: Optical properties II

HL 43.7: Vortrag

Donnerstag, 28. Februar 2008, 15:45–16:00, EW 201

Quantum Dot Superluminescent Light Emitting Diodes: Ideal Blackbody radiators? — •Martin Blazek¹, Wolfgang Elsäßer¹, Mark Hopkinson², and Michel Krakowski³ — ¹Institute of Applied Physics, Darmstadt University of Technology, Germany — ²Dept. E&E.E, University of Sheffield, United Kingdom — ³Alcatel Thales, III-V Lab, France

Quantum Dot (QD) Superluminescent Light Emitting Diodes (SLEDs) provide large optical bandwidths at desired wavelengths and are therefore promising devices for incoherent light application. The intensity noise behavior of QD SLEDs is of fundamental physical interest as it provides insight into the photon emission process. We performed high precision intensity noise measurements over several decades of optical output power. For low driving currents spontaneous emission leads to Shot Noise. For high currents we find Excess Noise behavior with Amplified Spontaneous Emission acting as the dominant source of noise. The QD SLEDs' noise can be described as blackbody radiation noise with a limited number of optical modes. It is therefore possible to identify the SLEDs' relevant intensity noise parameters.