February 4th 2021
The virtual Faraday Discussion on Time-Resolved Imaging of Photoinduced Dynamics just ended. I can honestly say that I learned a lot. It was obvious that the fast spectroscopy community speaks a different language and for me as an outsider it was a challenge to get in at first. But if you are interested in a new subject, you should not shy away from learning something new.
Our poster was well received and the engaging conversations were exciting. Overall, I enjoyed the cross-disciplinary communication and I am convinced that the discussions were a success.
January 18th 2021
On February 1-4, the Faraday Discussion on Time-Resolved Imaging of Photoinduced Dynamics will be held as a virtual meeting. This meeting was scheduled in Mumbai, but had to be rescheduled due to the ongoing pandemic. I am very excited to take part and to present a virtual poster.
December 21st 2020
Congratulations to Heloise on this new publication in ACS Catalysis on the mechanistic workings of light-driven catalysis of enzymes adsorbed on plasmonic nanomaterials (DOI: 10.1021/acscatal.0c04919, PDF) .
Heloise and I met during her stay at CIC biomaGUNE and it was a pleasure to do research with her. Together we performed photo-thermal experiments to correlate the catalytic activity with the generation of heat under NIR irradiation. We could show that the plasmonic heating accelerated the last step of the reaction by favoring product release. If this caught your interest, then also have a look at her recent review article in Biochemistry.
December 11th 2020
Our work on the robustness of colloidal SERS sensing probes has been published in ACS AMI (DOI: 10.1021/acsami.0c16398, PDF). Congratulations to Roland for his 2nd paper on plasmonic supraparticles linked by protein. This research was conducted in a cooperation between the Leibniz Institute of Polymer Research (IPF Dresden) and the Leibniz Institute of Photonics Technology (IPHT Jena). Best thanks to Izabella Jahn, Dana Cialla-May, and Prof. Jürgen Popp for the excellent cooperation.
Our paper deals with optically isotropic core/satellite superstructures with spherical cores, which exhibit lower SERS activity compared to anisotropic assemblies, but serve as a simple and reliable model system. We employed this model to highlight the aspect of sensing robustness which is of high importance for analytical applications.
November 12th 2020
The themed collection of the Faraday Discussion: Biological and Bio-Inspired Optics (Living Light Edition) is out now. Have a look at the contributed articles and the general discussions:
July 20th-22nd 2020
The new virtual addition to the Faraday Discussions series was a full success. The biennial meeting organised by the Living Light community focus on the light-matter interactions in living organisms. I had the pleasure to see many fascinating talks on biological and bio-inspired optics. In particular, the talks by Ullrich Steiner about designing refractive index fluids using the Kramers-Kronig relations.
Although plasmonic materials are somewhat exotic here, it was an excellent way to reach a new community of people. Our poster on the Size-Controlled Light-Matter Interactions of Colloidal Superstructures generated a lot of interest and I really enjoyed the discussions during the sessions. I was also delighted to meet a couple of friends from FAU Erlangen.
July 2nd 2020
Hurray! Our proposal for the Journal Cover was selected for the July issue of ACS Photonics.
The image artistically illustrates the interaction of light with a colloidal superstructure of a triangulated core decorated with gold nanoparticles. Besides the excitation of hotspots at the so-called satellite particles, the pronounced diffuse scattering is portrayed, which is characteristic for larger core particles above 100 nm in size.
May 28th 2020
Roland’s work on colloidal superstructures with triangular cores has been published in ACS Photonics (DOI: 10.1021/acsphotonics.0c00642, PDF). On the example of these core/satellite assemblies, comprising gold nanotriangles decorated with small gold nanospheres, we show the influence of mode-excitation matching and extinction characteristics on the SERS efficiency.
The variation of the core size and aspect ratio allowed tuning the main coupled mode between 700 and 800 nm, from off-resonant through resonant at 785 nm, as well as tuning extinction contributions, from dominantly absorbing to dominantly scattering. Our findings indicate a competition between SERS enhancement and increased scattering losses in larger assemblies. Thus, a balance of optical parameters is required for efficient SERS.