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Prof Wolfgang W Langbein

Overview

Prof Wolfgang W Langbein Position:Admission Tutor MSc Biophotonics Email:LangbeinWW ( at Cardiff.ac.uk )
 Telephone:029 208 70172
 Location:N/1.19

Research Interests

My current research interests are (i) characterisation and ultrafast spectroscopy of semiconductor nanostructures, microcavities, and quantum-dot optical amplifiers. (ii) application of optical spectroscopy to life-science, focussing on the techniques of coherent anti-stokes Raman scattering (CARS) microscopy, fluorescent resonant transfer, label-free optical biosensors using microcavities, and statistical analysis of individual quantum emitters such as colloidal quantum dots. For more information see http://langsrv.astro.cf.ac.uk/

Measures of Esteem

Conference Organisation:
Session Chair Quantum Optics Photon 12 (2012)
Program Committee Member UK Semiconductors 2012
Program Committee Member QD2010 (2010)

Recent Invited International Conference Talks:

Nonlinear Optical Microscopy
W. Langbein, International School Of Physics "Enrico Fermi": Microscopy applied to Biophotonics (3 Lectures, Varenna, Italy 12-22 July 2011)
Imaging spectroscopy applied to microcavity polaritons Coherent nonlinear dynamics of quantum dots in micropillar cavities in the strong coupling regime
W. Langbein, Conference on Cold Atoms, Semiconductor Polaritons and Nanoscience, POLATOM ESF research networking programme (2 Lectures, Chersonissos, Crete, Greece, May 2 - 6, 2011)
Two-dimensional nonlinear imaging of quantum dots: Polarization dynamics & Coherent coupling
W.Langbein and J.Kasprzak, Fundamental Optical Processes in Semiconductors (FOPS) Conference, 01-05 August 2011, Lake Junaluska, North Carolina.
Nonlinear vibrational microscopy - techniques and their limits
Wolfgang Langbein, Fall School on Raman and CARS microscopy, October 5-10, 2009 Cargese, Corsica, France invited.

Memberships:
I am a member of the DPG (Germany), the OSA (USA), SPIE, and the Institute of Physics (UK)

Other:
I was external PhD examiner in University of Lund (Sweden), EPF Lausanne (Switzerland), Universite Fourier, Grenoble (France)

Teaching

In the academic year 2011/12, I am teaching the following courses:

MSc Biophotonics:
PXT001 Modern light microscopy techniques (Module organizer)

BSc Physics:
PX3109 Solid state physics (Module organizer)

I hold first- and second-year tutorials, and supervise 3rd and 4th year project students. I am admission tutor for the MSc in Biophotonics.

Admin Duties

Member of the School Research Committee

Publications

Coherent coupling between distant excitons revealed by two-dimensional nonlinear hyperspectral imaging J. Kasprzak, B. Patton, V. Savona, W. Langbein Nature Photonics 5, 57-63 (2010), DOI: 10.1038/NPHOTON.2010.284

Up on the Jaynes-Cummings ladder of an exciton-cavity system J. Kasprzak S. Reitzenstein, E. Muljarov, C. Kistner, C. Schneider, M. Strauss, S. Hoefling, A. Forchel and W. Langbein Nature Materials 9, 304 (2010), DOI: 10.1038/NMAT2717

Brillouin-Wigner perturbation theory in open electromagnetic systems E. A. Muljarov, W. Langbein, and R. Zimmermann, Europhysics Letters 92, 50010 (2010), DOI: 10.1209/0295-5075/92/50010

Ultrafast gain dynamics in InP quantum-dot optical amplifiers Wolfgang Langbein, Valentina Cesari,  Francesco Masia, Andrey B. Krysa, Paola Borri and Peter M. Smowton Appl. Phys. Lett. 97,  211103 (2010)  DOI: 10.1063/1.3518715

Dephasing of excitons and multiexcitons in undoped and p-doped InAs/GaAs quantum dots-in-a-well Valentina Cesari, Wolfgang Langbein and Paola Borri Phys. Rev. B 82, 195314 (2010)  DOI: 10.1103/PhysRevB.82.195314

Four-wave-mixing imaging and carrier dynamics of PbS colloidal quantum dots Francesco Masia, Iwan Moreels, Zeger Hens, Wolfgang Langbein, and Paola Borri Phys. Rev. B 82, 155302 (2010) DOI: 10.1103/PhysRevB.82.155302

Measurement of the ultrafast gain recovery in InGaAs/GaAs quantum dots: Beyond a mean-field description Paola Borri, Valentina Cesari, Wolfgang Langbein, Phys. Rev. B 82, 115326 (2010) DOI: 10.1103/PhysRevB.82.115326

Coherent optical spectroscopy of semiconductor nanostructures W.Langbein,  Rivista del nuovo cimento 33,  255-312 (2010)

Resonant four-wave mixing of gold nanoparticles for three-dimensional cell microscopy Francesco Masia, Wolfgang Langbein, Peter Watson, and Paola Borri, Optics Letters 34, 1816-1818 (2009)

Coherent anti-Stokes Raman micro-spectroscopy using spectral focusing: Theory and Experiment Wolfgang Langbein, Israel Rocha-Mendoza, and Paola Borri,  J. Raman Spectroscopy (2009)

Refractive index dynamics and linewidth enhancement factor in p-doped InAs/GaAs quantum dot amplifiers V. Cesari, P. Borri, M. Rossetti, A. Fiore, W. Langbein, IEEE J. Quant. El. 45, 579-585 (2009)

The role of p-doping in the gain dynamics of InAs/GaAs quantum dots at low temperature Valentina Cesari, Wolfgang Langbein, Paola Borri, Appl. Phys. Lett. 94, 041110 (2009)

Coherent Antistokes Raman micro-spectroscopy using spectral focusing with glass dispersion Israel Rocha-Mendoza, Wolfgang Langbein, and Paola Borri, Appl. Phys. Lett. 93, 201103 (2008)

A monolithic optical sensor based on whispering-gallery modes in polystyrene microspheres, Julie Lutti, Wolfgang Langbein, and Paola Borri, Appl. Phys. Lett. 93, 151103 (2008)

Vectorial four-wave mixing field dynamics from individual excitonic transitions, Jacek Kasprzak and Wolfgang Langbein, Phys. Rev. B 78, 041103(R) (2008)

Optical resonances in microcylinders: Response to perturbations for biosensing, L. Chantada, N. I. Nikolaev, A. L. Ivanov, P. Borri, and W. Langbein, J. Opt. Soc. Am. B 25, 1312-1321 (2008)

Multiphoton Microscopy based on Four-Wave Mixing of Colloidal Quantum Dots Francesco Masia, Wolfgang Langbein, Paola Borri, Appl. Phys. Lett. 93, 021114 (2008)

Transient four-wave mixing of excitons in quantum dots from ensembles and individuals, P.Borri and W.Langbein, Book Chapter in "Semiconductor Quantum Bits", O. Benson and F. Henneberger editors,  World Scientific (2008)

High Q optical resonances of polystyrene microspheres in water controlled by optical tweezers, Julie Lutti, Wolfgang Langbein, and Paola Borri, Appl. Phys. Lett. 91, 141116 (2007)

Transient coherent nonlinear spectroscopy of single quantum dots, Wolfgang Langbein and Brian Patton, J. Phys.: Cond. Matter 19, 295203 (2007)

Four-wave mixing dynamics of excitons in InGaAs self-assembled quantum dots , Paola Borri and Wolfgang Langbein , J. Phys.: Cond. Matter 19, 295201 (2007)

Ultrafast gain dynamics in 1.3um InAs/GaAs quantum-dot optical amplifiers: The effect of p doping, Valentina Cesari, Wolfgang Langbein, Paola Borri, Marco Rossetti, Andrea Fiore, S. Mikhrin, I. Krestnikov and A. Kovsh, Appl. Phys. Lett. 90, 201103 (2007)

Polarization beats in ballistic propagation of exciton-polaritons in microcavities, W. Langbein, I. Shelykh, D. Solnyshkov, G. Malpuech, Y. Rubo, and A. Kavokin, Phys. Rev. B 75, 075323 (2007)

Whispering gallery modes of dielectric micro-spheres on a substrate, Nicolas Le Thomas, Ulrike Woggon, Wolfgang Langbein and Mikhail V.Artemyev, J. Opt. Soc. Am. B 23, 2361 (2006)

Realistic heterointerface model for excitonic states in growth-interrupted GaAs quantum wells, V.Savona and W.Langbein, Phys. Rev. B 74, 075311 (2006)

All spins under control, W.Langbein, Nature Materials, News & Views 5, 519 (2006)

Time- and spectrally-resolved four-wave mixing in single CdTe/ZnTe quantum dots, B.Patton, W.Langbein, U.Woggon, L. Maingault and H. Mariette, Phys. Rev. B 73, 235354 (2006)

Heterodyne spectral interferometry for multidimensional nonlinear spectroscopy of individual quantum systems, W.Langbein and B.Patton, Optics Letters 31, 1151 (2006)

Ultrafast carrier dynamics in InGaAs quantum dot materials and devices, P.Borri, S.Schneider, W.Langbein, and D.Bimberg, J. Opt. A: Pure Appl. Opt. 8, S33-–S46 (2006)

Dephasing of excited state excitons in InGaAs quantum dots, P. Borri, W. Langbein, E. A. Muljarov and R. Zimmermann, QD2006 Conference Proceedings, phys. stat. sol. (b) 243, 3890 (2006)

Coherent Control and Polarization Read-Out of Individual Excitonic States, B.Patton, U.Woggon and W.Langbein, Phys. Rev. Lett. 95, 266401 (2005)

Exciton dephasing via phonon interactions in InAs quantum dots: Dependence on quantum confinement, P.Borri, W.Langbein, U.Woggon, V.Stavarache, D.Reuter, and A.D.Wieck, Phys. Rev. B 71, 115328 (2005)

Polariton correlation in microcavities produced by parametric scattering, W.Langbein, phys. stat. sol. (b) 242, 2260 (2005)

Microscopic measurement of photon echo formation in groups of individual excitonic transitions, W.Langbein and B.Patton, Phys. Rev. Lett. 95, 017403 (2005)

Quantum complementarity of microcavity polaritons, S.Savasta, O. Di Stefano, V.Savona and W.Langbein, Phys. Rev. Lett. 94, 246401 (2005)

Phase coherent photorefractivity in ZnSe single quantum wells, H.P.Wagner, S.Tripathy, H.P.Tranitz and W.Langbein, Phys. Rev. Lett. 94, 147402 (2005)

Non-monotonous temperature dependence of the initial decoherence in quantum dots, A.Vagov, V.M.Axt, T.Kuhn, W.Langbein, P.Borri and U.Woggon, Phys. Rev. B 70, 201305(R) (2004)

Spontaneous parametric scattering of microcavity polaritons in momentum space, W.Langbein, Phys. Rev. B 70, 205301 (2004)

Linewidth enhancement factor in InGaAs quantum dot amplifiers, S.Schneider, P.Borri, W.Langbein, U.Woggon, R.L.Sellin, D.Ouyang and D.Bimberg, J. Quant. El. 40, 1423 (2004)

Radiatively Limited Dephasing in InAs Quantum Dots, W.Langbein, P.Borri, U.Woggon, V.Stavarache, D.Reuter, and A.D.Wieck, Phys. Rev. B 70, 033301 (2004)

Control of fine-structure splitting and biexciton binding in InGaAs quantum dots by annealing, W.Langbein, P.Borri, U.Woggon, V.Stavarache, D.Reuter, and A.D.Wieck, Phys. Rev. B 69, 161301(R) (2004)

Exciton dephasing in quantum dot molecules, P.Borri, W.Langbein, U.Woggon, M.Schwab, M.Bayer, S.Fafard, Z.Wasilewski, and P.Hawrylak, Phys. Rev. Lett. 91 267401 (2003)

Spectral Speckle Analysis of Resonant Secondary Emission from Solids, G.Kocherscheidt, W.Langbein, G.Mannarini, and R.Zimmermann, Phys. Rev. B 66, R161314 (2002)

Relaxation and dephasing of multiexcitons in semiconductor quantum dots, P.Borri, W.Langbein, S.Schneider, U.Woggon, R.L.Sellin, D.Ouyang, and D.Bimberg, Phys. Rev. Lett. 89, 187401 (2002)

Enhanced Resonant Backscattering of Excitons in Disordered Quantum Wells, W.Langbein, E.Runge, V.Savona, and R.Zimmermann, Phys. Rev. Lett. 89, 157401 (2002)

Rabi oscillations in the excitonic ground-state transition of InGaAs quantum dots, P. Borri, W. Langbein, S. Schneider, U. Woggon, R. L. Sellin, D. Ouyang, and D.Bimberg, Phys. Rev. B 66, 081306(R) (2002) (>50 cites)

Elastic Scattering Dynamics of Cavity Polaritons: Evidence of Time-Energy Uncertainty and Polariton Localization, W.Langbein and J.M.Hvam, Phys. Rev. Lett. 88, 047401 (2002)

Ultralong Dephasing Time in InGaAs Quantum Dots, P.Borri, W.Langbein, S.Schneider, U.Woggon, R.Sellin, D.Ouyang, and D.Bimberg, Phys. Rev. Lett. 87, 157401 (2001) (>350 cites)

Stimulated Secondary Emission from Semiconductor Microcavities, J.Erland, V.Mizeikis, W.Langbein, J.R.Jensen, and J.M.Hvam, Phys. Rev. Lett. 86, 5791 (2001)

Resonant Rayleigh scattering of exciton-polaritons in multiple quantum wells, G.Malpuech, A.Kavokin, W.Langbein, and J.M.Hvam, Phys. Rev. Lett. 85, 650 (2000)

Time-Resolved Speckle Analysis: A new Approach to Coherence and Dephasing of Optical Excitations in Solids, W.Langbein, J.M.Hvam, and R.Zimmermann, Phys. Rev. Lett. 82, 1040 (1999) (>84 cites)

Biography

I was born in Würzburg, Germany, in 1968. I received my Diploma in physics from the University of Kaiserslautern in 1992, and my PhD in physics from the University of Karlsruhe in 1995. From 1995 to 1998, I was assistant research professor at the Mikroelektronik Centret, Denmark. From 1998 to 2004, I was with the University of Dortmund, where I received my Habilitation in 2003. In 2004 I was appointed Senior Lecturer in the School of Physics, Cardiff University, promoted to Reader in 2006 and to Personal Chair in 2007.

Postgraduate Students

I'm presently (co-)supervising four post-doctoral fellows and four post-graduate students.