Forschung
Die Arbeitsgruppe um Robert Huber forscht in den Bereichen der optischen Kohärenztomographie (OCT), der nichtlinearen Bildgebung und der Laserphysik. Hierbei wird vor allem an neuartigen Pikosekundenlaser und an Fourier domain modengekoppelten (FDML) Lasern gearbeitet. Dieses Laserkonzept wurde von Robert Huber entwickelt und erlaubt, besonders schnell durchstimmbare Laserlichtquellen zu realisieren. Die Forschungsschwerpunkte liegen hier in der technologischen Weiterentwicklung, dem Verständnis der physikalischen Vorgänge und auch in der Implementierung von FDML Lasern für OCT. Neben der OCT werden FDML Laser auch für die nichtlineare Bildgebung und Spektroskopie verwendet.
Ein weiterer Schwerpunkt liegt in der optischen Kohärenztomographie mit durchstimmbaren Lichtquellen (swept source OCT, SS-OCT). Hier werden unter anderem die selbst entwickelten FDML Laser für die ultraschnelle Bildgebung eingesetzt, um Schnittbilder von biologischen Gewebe wie Haut oder Auge zu erzeugen. Aufgrund der hohen Durchstimmrate sind Anwendungen wie die VR-OCT, die in einer virtuellen Umgebung ganze Volumina mit Video-Wiederholraten in Echtzeit darstellt, möglich.
Mit der nichtlinearen optischen Bildgebung verfolgt die Arbeitsgruppe weitere Bildgebungsverfahren. Die Forschungsgebiete liegen in der zeitcodierten (TICO) Ramanspektroskopie und -mikroskopie, der Zweiphotonen-Fluoreszenzmikroskopie (TPEF) und der Zweiphotonen-Einzelpuls-Fluoreszenzlebenszeitbildgebung (SP-FLIM). Für diese Verfahren kommen neuartige Pikosekunden zum Einsatz die ebenfalls in der Arbeitsgruppe erforscht und entwickelt werden.
Unsere Forschungsschwerpunkte:
- Fourier Domain Mode Locked (FDML) Laser - Laserphysik, Technologie und Anwendung
- Optische Kohärenztomographie (OCT) - Anwendungen der MHz-OCT an Haut und Auge
- Nichtlineare Mikroskopie und Spektroskopie
- Pikosekundenlaser
Publikationen
2002
Elektronentransfer an Farbstoff-Halbleiter-Grenzflächen, Ludwig-Maximilians-Universität München, 06 2002.
Datei: | Huber_Robert.pdf |
Bibtex: | @PhdThesis{HU_2002_Huber_c, Title = {{Elektronentransfer an Farbstoff-Halbleiter-Grenzfl\"{a}chen}}, Author = {Huber, Robert}, School = {Ludwig-Maximilians-Universit\"{a}t M\"{u}nchen}, Year = {2002}, keywords = {AG-Huber}, Publisher = {Ludwig-Maximilians-Universit\"{a}t M\"{u}nchen}, Url = {http://edoc.ub.uni-muenchen.de/93/1/Huber_Robert.pdf} } |
Real-Time Observation of Photoinduced Adiabatic Electron Transfer in Strongly Coupled Dye/Semiconductor Colloidal Systems with a 6 fs Time Constant, J. Phys. Chem. B , vol. 106, no. 25, pp. 6494-6499, 06 2002.
DOI: | 10.1021/jp0155819 |
Bibtex: | @Article{HU_2002_Huber_a, Title = {{Real-Time Observation of Photoinduced Adiabatic Electron Transfer in Strongly Coupled Dye/Semiconductor Colloidal Systems with a 6 fs Time Constant}}, Author = {Huber, Robert and Moser, Jacques-E. and Gr\"{a}tzel, Michael and Wachtveitl, Josef}, Journal = {The Journal of Physical Chemistry B}, Year = {2002}, Month = jun, Number = {25}, Pages = {6494--6499}, Volume = {106}, keywords = {AG-Huber}, Doi = {10.1021/jp0155819}, ISSN = {1520-6106}, Url = {http://pubs.acs.org/doi/abs/10.1021/jp0155819} } |
Photoinduced electron transfer in dye/semiconductor systems on a sub-10-fs time scale - 2002 OSA Technical Digest Series, in The Thirteenth International Conference on Ultrafast Phenomena , Optica Publishing Group, 052002. pp. ThC5.
DOI: | 10.1364/UP.2002.ThC5 |
Bibtex: | @inproceedings{Huber:02, author = {Robert Huber and Jacques E. Moser and Michael Gr\"{a}tzel and Josef Wachtveitl}, booktitle = {The Thirteenth International Conference on Ultrafast Phenomena}, journal = {The Thirteenth International Conference on Ultrafast Phenomena}, keywords = {Spectroscopy, surface; Femtosecond phenomena; Molecules; Pump probe spectroscopy; Semiconductors; Solar energy; Temporal resolution; Titanium dioxide}, pages = {ThC5}, publisher = {Optica Publishing Group}, title = {Photoinduced electron transfer in dye/semiconductor systems on a sub-10-fs time scale}, year = {2002}, url = {https://opg.optica.org/abstract.cfm?URI=UP-2002-ThC5}, doi = {10.1364/UP.2002.ThC5}, abstract = {Pump-probe investigation of alizarin adsorbed on the surface of TiO2 colloids reveals a 6 femtosecond electron transfer from the dye molecule to the semiconductor surface, allowing to identify the key factors for this ultrafast electron transfer.}, } |
2001
Noncollinear optical parametric amplifiers with output parameters improved by the application of a white light continuum generated in CaF2, Optics Communications , vol. 194, no. 4, pp. 443-448, 07 2001.
DOI: | 10.1016/S0030-4018(01)01324-4 |
Bibtex: | @article{HUBER2001443, title = {Noncollinear optical parametric amplifiers with output parameters improved by the application of a white light continuum generated in CaF2}, journal = {Optics Communications}, volume = {194}, number = {4}, pages = {443-448}, year = {2001}, issn = {0030-4018}, doi = {https://doi.org/10.1016/S0030-4018(01)01324-4}, url = {https://www.sciencedirect.com/science/article/pii/S0030401801013244}, author = {Robert Huber and Helmut Satzger and Wolfgang Zinth and Josef Wachtveitl}, keywords = {Femtosecond pulses, Parametric amplification, White light continuum, Supercontinuum, Frequency conversion, Amplification bandwidth, Calcium fluoride (CaF)}, abstract = {We report the drastic improvement of output parameters of femtosecond noncollinear optical parametric amplifiers by applying supercontinuum seed pulses generated in CaF2 instead of sapphire and imaging via all reflective optics. Features of the setup are broad amplification bandwidths up to 310 THz (470–910 nm), an almost Gaussian beam profile, a divergence with M2 factor of less than 1.4, pulse to pulse energy fluctuations of less than 2.5% and compressibility of the pulses down to 16 fs. The high intensity of the supercontinuum seed pulse (80 nJ) yields a quantum efficiency for the conversion of pump to signal of more than 30%. Even for short wavelengths e.g. at 470 nm pulse energies above 30 μJ were obtained for 110 μJ of 400 nm pump light.} } |
2000
The Role of Surface States in the Ultrafast Photoinduced Electron Transfer from Sensitizing Dye Molecules to Semiconductor Colloids, The Journal of Physical Chemistry B , vol. 104, no. 38, pp. 8995-9003, 09 2000. American Chemical Society.
DOI: | 10.1021/jp9944381 |
Bibtex: | @Article{HU_2000_Huber_a, Title = {{The Role of Surface States in the Ultrafast Photoinduced Electron Transfer from Sensitizing Dye Molecules to Semiconductor Colloids}}, Author = {Huber, Robert and Sp\"{o}rlein, Sebastian and Moser, Jacques E and Gr\"{a}tzel, Michael and Wachtveitl, Josef}, Journal = {The Journal of Physical Chemistry B}, Year = {2000}, Month = sep, Number = {38}, Pages = {8995--9003}, Volume = {104}, keywords = {AG-Huber}, Doi = {10.1021/jp9944381}, ISSN = {1520-6106}, Publisher = {American Chemical Society}, Url = {http://pubs.acs.org/doi/abs/10.1021/jp9944381} } |
Surface States Control Ultrafast Electron Injection in Dye/Semiconductor Colloidal Systems, in Ultrafast Phenomena XII - Proceedings of the 12th International Conference , Springer, 2000. pp. 456--458.
DOI: | 10.1007/978-3-642-56546-5_133 |
Bibtex: | @InProceedings{10.1007/978-3-642-56546-5_133, author="Huber, Robert and Sp{\"o}rlein, Sebastian and Moser, Jacques E. and Gr{\"a}tzel, Michael and Wachtveitl, Josef", title="Surface States Control Ultrafast Electron Injection in Dye/Semiconductor Colloidal Systems", booktitle="Ultrafast Phenomena XII", year="2001", publisher="Springer Berlin Heidelberg", address="Berlin, Heidelberg", pages="456--458", abstract="Electron injection from photoexcited dye molecules into semiconductor colloidal particles (TiO2 and ZrO2) is investigated by femtosecond (fs) spectroscopy. Ultrafast reaction dynamics in the dye/ZrO2-system with an inaccessible conduction band demonstrates efficient electron transfer to surface defect states.", isbn="978-3-642-56546-5" } |
1999
Ultrafast photoinduced electron transfer in coumarin 343 sensitized TiO2-colloidal solution, International Journal of Photoenergy , vol. 1, no. 3, pp. 153-155, 1999.
DOI: | 10.1155/S1110662X99000264 |
Bibtex: | @Article{HU_1999_Wachtveitl_a, Title = {{Ultrafast photoinduced electron transfer in coumarin 343 sensitized TiO2-colloidal solution}}, Author = {Wachtveitl, Josef and Huber, Robert and Sp\"{o}rlein, Sebastian and Moser, Jacques E and Gr\"{a}tzel, Michael}, Journal = {International Journal of Photoenergy}, Year = {1999}, Number = {3}, Pages = {153--155}, Volume = {1}, keywords = {AG-Huber}, Doi = {10.1155/S1110662X99000264}, ISSN = {1110-662X}, Url = {http://www.hindawi.com/journals/ijp/1999/418298/abs/} } |
1998
Laser-induced thermal expansion of a scanning tunneling microscope tip measured with an atomic force microscope cantilever, Appl. Phys. Lett. , vol. 73, no. 17, pp. 2521-2523, Okt. 1998.
DOI: | 10.1063/1.122502 |
Bibtex: | @Article{HU_1998_Huber_b, Title = {{Laser-induced thermal expansion of a scanning tunneling microscope tip measured with an atomic force microscope cantilever}}, Author = {Huber, R and Koch, M and Feldmann, J}, Journal = {Applied Physics Letters}, Year = {1998}, Number = {17}, Pages = {2521}, Volume = {73}, keywords = {AG-Huber}, Doi = {10.1063/1.122502}, ISSN = {00036951}, Url = {http://scitation.aip.org/content/aip/journal/apl/73/17/10.1063/1.122502} } |
Time-resolved thermal expansion of an STM tip after ultrafast optical excitation, in Technical Digest. Summaries of Papers Presented at the Conference on Lasers and Electro-Optics. Conference Edition. 1998 Technical Digest Series (IEEE Cat. No.98CH36178) , 1998. pp. 526-527.
DOI: | 10.1109/CLEO.1998.676586 |
Bibtex: | @INPROCEEDINGS{676586, author={Huber, R. and Koch, M. and Perner, M. and Spirkl, W. and Feldmann, J.}, booktitle={Technical Digest. Summaries of Papers Presented at the Conference on Lasers and Electro-Optics. Conference Edition. 1998 Technical Digest Series, Vol.6 (IEEE Cat. No.98CH36178)}, title={Time-resolved thermal expansion of an STM tip after ultrafast optical excitation}, year={1998}, volume={}, number={}, pages={526-527}, doi={10.1109/CLEO.1998.676586}} |
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