0000004435 20W 2SWS VO Advanced Optical Spectroscopy of Semiconductor Nanomaterials   Hilfe Logo

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Advanced Optical Spectroscopy of Semiconductor Nanomaterials 
Winter semester 2020/21
Chair of Semiconductor Quantum Nanosystems (E24) (Prof. Finley)
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This MSc level lecture focuses on advanced optical laser spectroscopy techniques and their application to probe the fundamental physical, electronic, vibrational and optical properties of semiconductors, novel heterointerfaces and quantum confined nanostructures. The course complements perfectly Semiconductor Synthesis and Nanoanalytics (PH2189) presented by Prof. Sharp. Modern laser systems are capable of generating intense, highly coherent electromagnetic fields that interact with the electrons in a solid. Such light-matter interactions give rise to a fascinating range of phenomena, ranging from incoherent responses such as stead-state and ultra-fast luminescence to coherent dynamical responses like four-wave mixing (FWM), optical pumping and multi-dimensional time-resolved spectroscopy having sub-picosecond temporal resolution. Besides facilitating the direct characterization of semiconductor materials, novel-heterointerfaces and nanoscale devices, these methods provide direct information on fundamental opto-electronic processes such as electron transfer, energy relaxation and thermalization, tunneling and transport dynamics and the interactions between electrons in the solid and diverse (e.g. vibrational, spin and magnetic) degrees of freedom in the nanoscale solids. We will discuss both far-field optical spectroscopic methods, that operate over length scales beyond the diffraction limit, as well as nano-optical approaches capable of probing systems at the size of the electronic wavefunction. The aim of this module is to introduce MSc students to the state-of-the-art in optical spectroscopic methods as they are utilized in the condensed matter and semiconductor physics research communities. We will introduce the underlying physics of the various methods, describe how they are implemented experimentally in the lab and examine specific case studiesfrom the literature that have led to key breakthroughs in condensed matter and semiconductor physics.

Specific topics will include:

Review of key-semiconductor materials and fundamental light-matter interactions (2 lectures)
Incoherent Optical Spectroscopy Methods (5 lectures)
-Tools of the trade (CW and ultrafast-lasers, photo-detectors, monochromators and interferometers, signal detection / processing, cryogenics)
-Nanoscale optical microscopy
-Spectroscopy of single semiconductor nanostructures

Coherent (Non-Linear) Optical Spectroscopy (4 lectures)
-Luminescence vs Reflection / Transmission Spectroscopy
-Semiconductor Bloch Equations and Coherence Effects
-Strong Excitation Effects
-AC Stark Effect and Transient Spectral Oscillations
-Examples (FWM, Photon echo, Resonance Fluorescence)
-Decoherence and Phase Relaxation in NWs (exciton-exciton, e-X and exciton-phonon interactions
-Raman and Brillouin Scattering

Ultrafast Optical Methods (3 lectures)
-Regimes towards equilibrium (relaxation, thermalization and recombination)
-Pump-Probe Spectroscopy Methods
-Probing Exciton and Phonon Dynamics in Bulk, QWs and QDs
-Exciton Dynamics (Pico and Femtosecond Studies)
-Light-emission and optical interactions in nanoscale environments
Condensed Matter Physics (KM Intro or KM1 & 2)
After successful completion of the module the students are able to:
1.Understand the rationale underlying incoherent and coherent optical spectroscopic methods as applied to commonly studied semiconductor-based materials and their nanostructures.

2.Explain the physics underpinning light-matter interactions in semiconductors, including: (a) incoherent luminescence spectroscopy, (b) methods to focus optical fields to the nanoscale, (c) super-resolution methods to probe individual nanostructures, (d) coherent optical spectroscopy and (e) time-resolved methods with sub-picosecond temporal resolution.
3. Sketch typical experimental set-ups used to perform different types of incoherent and coherent optical spectroscopy experiments and explain the operational principles of the methods.

4. Discuss the different regimes of incoherent spectroscopy and the related phenomena that occur at weak, intermediate and strong optical excitation levels.

5.Explain the working principles of Raman and Brillouin light scattering experiments and give examples

6. Design optical experiments to probe specific characteristics of nanostructures, interpret optical data and judge experimental data presented in the scientific literature
class lecture
The lecture will be mostly presented on the blackboard with some PPT for images, video
s etc. The course will be complemented by a weekly Tutorial / Lab Class that will introduce some of the methods discussed in practical experiments and support ideas with discussions of landmark results obtained using the various techniques. Emphasis will be placed on understanding not just *how* various spectroscopy techniques are applied, but on the underlying *physics* including analysis of real world data.
Für die Anmeldung zur Teilnahme müssen Sie sich in TUMonline als Studierende/r identifizieren.
Online information
course documents
e-learning course (moodle)