Soft Condensed Matter Group

Breadcrumb Navigation

Dr. Fritz Keilmann

Dr. Fritz Keilmann


Lehrstuhl Prof. Rädler
Geschwister-Scholl-Platz 1
80539 München

Altbau Physik, N 033

Phone: +49-(0)89-2180-1414
Fax: +49-(0)9113-0844-88883

Research Focus

Infrared nanoscopy of soft/ biological matter, mid-infrared frequency combs

Welcome to the LMU Infrared Nanoscopy Laboratory


Scientific curriculum

Study of meteorology and physics, München, Diplom thesis on microwave spectroscopy of hemoglobin

Dr. rer. nat. Technische Hochschule München, Thesis on plasma diagnostics with infrared lasers

Max-Planck-Institut für Plasmaphysik, Garching, Infrared ion temperature measurement in Tokamak

Massachusetts Institute of Technology, Cambridge, USA Precision frequency measurement, optically pumped lasers, saturation spectroscopy of gases

Max-Planck-Institut für Festkörperforschung, Stuttgart, Nonlinear far-infrared spectroscopy, phonon spectroscopy, biological microwave effects, semiconductor physics, optics

Visiting Scientist University of California in Santa Barbara, USA, Free electron laser, nonlinear spectroscopy

Max-Planck-Institut für Biochemie, Martinsried, Scanning near- field microscopy, infrared spectroscopy, biophysics

Max Planck Institut für Quantenoptik, Garching, Broadband- infrared near-field microscopy

since 2013
Ludwig-Maximilians-Universität, München, Spectroscopic nanoscopy of composite materials



Kenneth J Button prize 2009 (



Biography (PDF, 367 kB)


Recent Publications



Conformation in ultrathin polymer brush coatings resolved by infrared nanoscopy
A. Santos Pereira, A. Cernescu, J. Svoboda, R. Sivkova, I. Romanenko, Bogdana Bashta, F. Keilmann, and O. Pop-Georgievski
Analytical Chemistry 92, 4716, Doi: 10.1021/acs.analchem.9b05661 (2020)

Near-field infrared nanospectroscopy of surface phonon-polariton resonances
P. McArdle, D.J. Lahneman, A. Biswas, F. Keilmann, and M.M. Qazilbash
Physical Review Research 2, DOI: 10.1103/PhysRevResearch.2.023272 (2020)



Anisotropic strain-induced soliton movement changes stacking order and band structure of graphene multilayers: Implications for charge transport
F.R. Geisenhof, F. Winter, S. Wakolbinger, T.D. Gokus, Y. C. Durmaz, D. Priesack, J. Lenz, F. Keilmann, K. Watanabe, T. Taniguchi, R. Guerrero-Avilés, M. Pelc, A. Ayuela, and R.T. Weitz
ACS Appl. Nano Mater., DOI: 10.1021/acsanm.9b01603 (2019)



Phase-resolved terahertz self-detection near-field microscopy
M.C. Giordano, S. Mastel, C. Liewald, L.L. Columbo, M. Brambilla, L. Viti, A. Politano, K. Zhang, L. Li, A.G. Davies, E.H. Linfield, R. Hillenbrand, F. Keilmann, G. Scamarcio, and M.S. Vitiello
Optics Express 26, 14, DOI: 10.1364/OE.26.018423 (2018)

All-electronic terahertz nanoscopy
C. Liewald, S. Mastel, J. Hesler, A.J. Huber, R. Hillenbrand, and F. Keilmann
Optica 5, 159, DOI: 10.1364/OPTICA.5.000159 (2018)



Artifact-free time-resolved near-field spectroscopy
A.J. Sternbach, J. Hinton, T. Slusar, A.S. McLeod, M.K. Liu, A. Frenzel, M. Wagner, R. Iraheta, F. Keilmann, A. Leitenstorfer, M. Fogler, H.-T. Kim, R.D. Averitt, and D.N. Basov
Optics Express 25, 28589 (2017)

Transferable organic semiconductor nanosheets for application in electronic devices
S.J. Noever, M.Eder, F. del Giudice, J. Martin, F.X. Werkmeister, S. Hallwig, S. Fischer, O. Seeck, N. Weber, C. Liewald, F. Keilmann, A. Turchanin, and B. Nickel
Advanced Materials 29, 1606283, DOI: 10.1002/adma.201606283 (2017)

Efficiency of launching highly confined polaritons by infrared light incident on a hyperbolic material
S. Dai, Q. Ma, Y. Yang, J. Rosenfeld, M.D. Goldflam, A. McLeod, Z. Sun, T. I. Andersen, Z. Fei, M. Liu, Y. Shao, K. Watanabe, T. Taniguchi, M. Thiemens, F. Keilmann, P. Jarillo-Herrero, M.M. Fogler, and D.N. Basov
Nano Letters 17, 5285 (2017)

Anisotropic excitation of surface plasmon polaritons on a metal film by a scattering-type scanning near-field microscope with a non-rotationally-symmetric probe tip
F. Walla, M. M. Wiecha, N. Mecklenbeck, S. Beldi, F. Keilmann, M. D. Thomson, and H. G. Roskos
Nanophotonics, DOI:10.1515/nanoph-2017-0042 (2017)



Ultrafast optical switching of infrared plasmon polaritons in high-mobility graphene
G.X. Ni, L. Wang, M.D. Goldflam, M. Wagner, Z. Fei, A.S. McLeod, M.K. Liu, F. Keilmann, B. Özyilmaz, A.H. Castro Neto, J. Hone, M.M. Fogler, and D.N. Basov
Nature Materials, doi:10.1038/nphoton.2016.45 (2016)



Graphene on hexagonal boron nitride as a tunable hyperbolic metamaterial
S. Dai, Q. Ma, M. K. Liu, T. Andersen, Z. Fei, M.D. Goldflam, M. Wagner, K. Watanabe, T. Taniguchi, M. Thiemens, F. Keilmann, G.C.A.M. Janssen, S-E. Zhu, P. Jarillo-Herrero, M.M. Fogler, and D.N. Basov
Nature Nanotechnology 10, 682, doi:10.1038/nnano.2015.131 (2015)

Graphene-based platform for infrared near-field nanospectroscopy of water and biological materials in an aqueous environment
O. Khatib, J.D. Wood, A.S. Mcleod, M.D. Goldflam, M. Wagner, G.L. Damhorst, J.C. Koepke, G.P. Doidge, A. Rangarajan, R. Bashir, E. Pop, J.W. Lyding, M.H. Thiemens, F. Keilmann, and D.N. Basov
ACS Nano 9, 7968 (2015)

Plasmons in graphene moire superlattices
G.X. Ni, H. Wang, J.S. Wu, Z. Fei, M.D. Goldflam, F. Keilmann, B. Özyilmaz, A.H. Castro-Neto, X.M. Xie, M.M. Fogler, and D.N. Basov
Nature Materials, doi:10.1038/NMAT4425 (2015)

Tunneling plasmonics in bilayer graphene
Z. Fei, E.G. Iwinski, G.X. Ni, L.M. Zhang, W. Bao, A.S. Rodin, Y. Lee, M. Wagner, M.K. Liu, S. Dai, M.D. Goldflam, M. Thiemens, F. Keilmann, C.N. Lau, A.H. Castro-Neto, M.M. Fogler, and D.N. Basov
Nanoletters 15, 4973 (2015)

Subdiffractional focusing and guiding of polaritonic rays in a natural hyperbolic material
S. Dai, Q. Ma, T. Anderson, A.S. Mcleod, Z. Fei, M.K. Liu, M. Wagner, W. Watanabe, T. Taniguchi, M. Thiemens, F. Keilmann, P. Jarillo-Herrero, M.M. Fogler, and D.N. Basov
Nature Communications 6, 7963, doi:10.1038/ncomms7963 (2015)



Nanoscale infrared spectroscopy as a non-destructive probe of extraterrestrial samples
G. Dominguez, A.S. Mcleod, Z. Gainsforth, P. Kelly, H.A. Bechtel, F. Keilmann, A. Westphal, M. Thiemens, and D.N. Basov
Nature Communications 5: 5445, doi 10.1038/ncomms6445 (2014)

Ultrafast dynamics of surface plasmons in InAs by time-resolved infrared nanospectroscopy
M. Wagner, A.S. McLeod, S.J. Maddox, Z. Fei, M. Liu, R. D. Averitt, M.M. Fogler, S.R. Bank, F. Keilmann, and D.N. Basov
NanoLetters 14, 4529-4534 (2014)

Sub-micron phase coexistence in small-molecule organic thin films revealed by infrared nano-imaging
C. Westermeier, A. Cernescu, S. Amarie, C. Liewald, F. Keilmann, and B. Nickel
Nature Communications 5: 4101, doi 10.1038/ncomms5101 (2014)

Tunable phonon polaritons in atomically thin van der Waals crystals of boron nitride
S. Dai, Z. Fei, Q. Ma, A.S. Rodin, M. Wagner, A.S. McLeod, M.K. Liu, W. Gannett, W. Regan, K. Watanabe, T. Taniguchi, M. Thiemens, G. Dominguez, A.H. Castro Neto, A. Zettl, F. Keilmann, P. Jarillo-Herrero, M.M. Fogler, D.N. Basov
Science 343, 1125-1129 (2014)

Ultrafast and nanoscale plasmonic phenomena in exfoliated graphene revealed by infrared pump-probe nanoscopy
M. Wagner, Z. Fei, A.S. McLeod, A.S. Rodin, W. Bao, E.G. Iwinski, Z. Zhao, M. Goldflam, M. Liu, G. Dominguez, M. Thiemens, M.M. Fogler, A.H. Castro Neto, C. N. Lau, S. Amarie, F. Keilmann, and D.N. Basov
NanoLetters 14, 894-900 (2014)



Electronic and plasmonic phenomena at graphene grain boundaries

Z. Fei, A.S. Rodin, W. Gannett, S. Dai, W. Regan, M. Wagner, M. Liu, A.S. McLeod, G. Dominguez, M. Thiemens, A.H. Castro Neto, F. Keilmann, A. Zettl, R. Hillenbrand, M.M. Fogler, and D.N. Basov

Nature Nanotechnology 8, 821-825 (2013)

Nano-FTIR—the Chemical Nanoscope
F. Keilmann, R. Hillenbrand, and A.S. McLeod
Imaging & Microscopy 1, 26 (2013)



Visualisation of methacrylate-embedded human bone sections by infrared nanoscopy
T. Geith, S. Amarie, S. Milz, F. Bamberg, and F. Keilmann
J. Biophotonics DOI: 10.1002 (2012)

Gate-tuning of graphene plasmons revealed by infrared nano-imaging
Z. Fei, G.O. Andreev, W. Bao, A.S. McLeod, ..., F. Keilmann and D.N. Basov
Nature 487, 83 (2012)

Nano-FTIR absorption spectroscopy of molecular fingerprints at 20 nm spatial resolution
F. Huth, A. Govyadinov, S. Amarie, ..., F. Keilmann and R. Hillenbrand
NanoLetters 12, 3973 (2012)

Mid-infrared frequency comb spanning an octave based on an Er fiber laser and difference-frequency generation
F. Keilmann and S. Amarie
Journal of Infrared, Millimeter, and Terahertz Waves 33, 479 (2012)

Nano-FTIR chemical mapping of minerals in biological materials
S. Amarie, Paul Zaslansky, Y. Kajihira, E. Griesshaber, ..., and F. Keilmann
Beilstein J. Nanotechol. 3, 312 (2012)



Infrared nanoscopy of Dirac plasmons at the graphene/SiO2 interface
Z. Fei, G.O. Andreev, W. Bao, L.M. Zhang, ..., F. Keilmann, and D.N. Basov
NanoLetters 11, 4701 (2011)

Broadband-infrared assessment of phonon resonance in scattering-type near-field microscopy
S. Amarie and F. Keilmann
Phys. Rev. B 83, 45404 (2011)