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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

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Ultrafast field-resolved semiconductor spectroscopy utilizing quantum interference control of currents.

Claudia Ruppert¹, Jan Lohrenz, Sebastian Thunich

¹Experimentelle Physik 2, TU Dortmund, Dortmund, Germany.

|October 9, 2012

Summary

We developed a new method to precisely measure optical nonlinearities in semiconductors. This technique resolves both amplitude and phase changes, offering deeper insights into material responses.

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Area of Science:

Solid-state physics
Quantum optics
Materials science

Background:

Optical nonlinearities in semiconductors are crucial for optoelectronic devices.
Existing methods often lack the precision to resolve both amplitude and phase dynamics.
Understanding these nonlinearities is key to advancing semiconductor technologies.

Purpose of the Study:

To introduce a versatile technique for time-resolving optical nonlinearities in semiconductors.
To measure both amplitude and phase modifications induced by optical pumping.
To demonstrate the technique's application in analyzing excitonic nonlinearities and two-photon absorption.

Main Methods:

Implementation of a novel ω/2ω pulse pair technique.
Coherent control of current generation in a semiconductor detector.
Acquisition and analysis of current interferograms by scanning time delays.
Application to CdTe thin films and ZnSe.

Main Results:

Successfully resolved the electric field of the 2ω component and its pump-induced modifications.
Characterized excitonic optical nonlinearity in CdTe at 385 THz.
Resolved pump-induced amplitude and phase distortions in ZnSe due to two-photon absorption and cross-phase modulation.

Conclusions:

The developed method provides unprecedented time resolution for optical nonlinearities.
It enables detailed characterization of fundamental semiconductor optical processes.
This technique opens new avenues for studying light-matter interactions in semiconductors.