Thermally Trapped Single Molecules

Here it is finally. The paper by Marco on trapping single DNA molecules just got accepted by Nano Letters. Congratulations Marco! Yet another occasion for a great cake for the lab!

Photothermal Light Modulator

This has been a true fight. After some strange and even contradicting referee reports in Nano Letters we are now happy to have the “photothermal light modulator” published in ACS Nano. Congratulations André for the first paper.

Thermophoretic Single Particle Trap

Following a long preparation time of the manuscript, Marco finally succeeded to get his paper on single particle thermophoretic trapping accepted by ACS Nano. Congratulations!

Thermally Driven Nanobots …

How control microbots using thermal fluctuations? This is answered jointly with our colleagues from Princeton University (Prof. Haw Yang, Chemistry Department) in our recent paper on “Harnessing thermal fluctuations for purposeful activities: the manipulation of single micro-swimmers by adaptive photon nudging”, which appeared yesterday in Chemical Science online.

And The Winner Is …

This time, the winner is Romy, collecting a prize for the best student oral presentation at the European Optical Society topical meeting on Biophotonics: Optical Manipulation and OCT Imaging in Life Sciences and Medicine. Congratulations!

And The Winner Is …

This time, the winner is Subhasis, collecting a prize for the 2nd best poster at the 11th Hole Burning, Single Molecule and Related Spectroscopies Meeting in Tübingen. Congratulations!

Next Paper Arrived

After a long battle our paper on “Gaussian beam photothermal single particle microscopy” has finally found its way into the JOSA. Photothermal single molecule detection is thus getting easy.

And The Winner Is …

Well, we did not win the fight against the other 9 short films during the 1. Nano-Kurzfilm Filmfestival in Halle yesterday, but at least we realized that our contribution matches the overall outstanding quality of the other movies.

Objekte auf Nanometerskala werfen keinen Schatten bei Beleuchtung mehr. Das Licht wird an ihnen gestreut, je kleiner die Partikel, desto weniger, bis die Partikel nahezu vollkommen unsichtbar sind. Solche Nanopartikel sind kaum in der Mikroskopie zu erkennen und erfordern neue optische Methoden. Die photothermische Mikroskopie nutzt dazu die Absorption von Licht durch die Nanopartikel. Das absorbierte Licht wird in Wärme umgewandelt und verändert die Temperatur und damit die optischen Eigenschaften in seiner Umgebung. Dadurch erscheint das Nanoobjekt größer und wird detektierbar. Der eigentliche Effekt ist allerdings noch diffizieler, da auf der Längenskala von wenigen Nanometern die Wellennatur des Lichtes hervortritt. Licht wird gebeugt und erzeugt komplexe Interferenzstrukturen. Markus Selmke und Marco Braun haben herausgefunden, dass der spezielle räumliche Verlauf der optischen Brechkraft um das Nanopartikel Effekte erzeugt die einer makroskopischen Zerstreuungslinse entsprechen, obwohl man sich auf der Nanometerskala befindet.

10 Left

After some great performance of our two movie actors Marco and Markus, the hard work pays off. The nanspot is among the 10 last spots in the 1.Nano-Kurzfilm-Festival.
The three winners will be selected from this last round of 10 spots on the 5th of July in Halle. So stay tuned!


Yesterday was devoted to our two TV stars Marco and Markus, who have performed for a short spot on Nanoscience. Wait for the outtakes …

Two Poster Prizes

Two PhD students of the group have been awarded with a poster prize at the annular spring meeting of the DPG.
The winners are Romy Schachoff and Andreas Bregulla. Congratulations!

The two posters are entitled

“Twin-Focus Photothermal Correlation Spectroscopy – Twin-PhoCS”
by Romy Schachoff, Markus Selmke, Marco Braun and Frank Cichos

“Rotational Behavior of Thermophoretically Driven Janus Particles at a Hard Wall”
Andreas Bregulla, Ralf Seidel, Michael Mertig, Klaus Kroy and Frank Cichos

New Papers

The group has published two new papers on photothermal single particle detection in ACSNano and Optics Express. The ACSNano paper has been well acknowledged in a number of press reports. Congratulations to the authors Markus Selmke and Marco Braun.

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