Dr. Gregor Bracher

 
Year: 2016
Hi there!

My name is Gregor and I'm a PhD student in the group of J. J. Finley. My work is focused on investigations of guided surface plasmon polaritons (SPPs) along Au waveguides on GaAs and their coupling to near surface InGaAs quantum dots (QDs). Our results reveal SPP propagation lengths from 13±1 µm to 27 ± 1 µm as the waveguide width increases from w = 2 - 5 µm. Experiments on active structures containing near surface QDs clearly show that SPPs excite QDs providing a new method to image the SPP mode (see inset of figure 1).
Figure 1 shows a schematic of plasmonic directional couplers, where we combine of two of these waveguides in order to realise 50-50 beamsplitters for future on-chip quantum optics experiments.

Publications

Imaging surface plasmon polaritons using proximal self-assembled InGaAs quantum dots

J. Appl. Phys. 116, 033101 (2014)

G. Bracher | K. Schraml | M. Blauth | J. Wierzbowski | N. Coca Lopez | M. Bichler | K. Mueller | J. Finley | M. Kaniber

Online Reference

Optical properties and interparticle coupling of plasmonic bowtie nanoantennas on a semiconducting substrate

Phys. Rev. B 90, 035435 (2014)

K. Schraml | M. Spiegl | M. Kammerlocher | G. Bracher | J. Bartl | T. Campbell | J. Finley | M. Kaniber

Online Reference

Optical study of lithographically defined, subwavelength plasmonic wires and their coupling to embedded quantum emitters

Nanotechnology 25, 075203 (2014)

G. Bracher | K. Schraml | M. Ossiander | S. Frédérick | J. Finley | M. Kaniber

Online Reference

Lasing from individual GaAs-AlGaAs core-shell nanowires up to room-temperature

Nature Comm. 4, 2931 (2013).

B. Mayer | D. Rudolph | J. Schnell | S. Morkötter | J. Winnerl | J. Treu | K. Mueller | G. Bracher | G. Abstreiter | G. Koblmueller | J. Finley

Online Reference

Coupling of guided surface plasmon polaritons to proximal self-assembled InGaAs quantum dots

Proc. of SPIE 8269, 826920 (2012)

G. Bracher | K. Schraml | M. Blauth | C. Jakubeit | G. Koblmueller | K. Mueller | M. Bichler | M. Kaniber | J. Finley

Download   Online Reference

Direct measurement of plasmon propagation lengths on lithographically defined metallic waveguides on GaAs

Journal of Applied Physics 110, 123106 (2011)

G. Bracher | K. Schraml | C. Jakubeit | M. Kaniber | J. Finley

Online Reference

TUM Technische Universität München TUM Technische Universität München Physik Department Elektrotechnik und Informationstechnik TUM Technische Universität München
 

Events & News

17 Jan 2018

ERC Consolidator Grant for Gregor Koblmüller   more

16 Jan 2018

Light-steering of spin-polarized currents in topological insulators   more

10 Aug 2017

Best Poster Awards for Ganpath Veerabathran and Alexander Andrejew at iNOW 2017   more

27 Jun 2017

Best Poster Award at Nanowire Week for Jochen Bissinger   more

15 Mar 2017

Dr. Kai Müller admitted to the “Junges Kolleg” of the Bavarian Academy of Sciences   more

Seminars

March 12, 2018

Two-dimensional coherent spectroscopy of a semiconductor microcavity   more

March 05, 2018

Diamond-organic photovoltaics   more