Temperature Measurement in Plasmonic Nanoapertures Used for Optical Trapping
Optical absorption in plasmonic structures lead to a local temperature increase. It was long assumed that in the case of nanoapertures, the extended metal layer was acting as an efficient heat sink to mitigate the warming. However, the reality is that temperature increases higher than 10°C can be readily achieved in gold apertures illuminated by a tightly focused infrared beam of mW power. We find this in a recent article published in ACS Photonics, as we develop three independent fluorescence readouts to measure locally the temperature in single and double nanoholes.
Significance:
- We provide a clear quantification of the temperature increase in nanoaperture-based optical tweezers
- We establish several methods to locally measure the temperature by recording fluorescence properties (intensity, diffusion time and lifetime). These approaches can be easily implemented and applied to other nanophotonic systems.
- The easy control of the temperature inside nanoapertures opens their use for thermoplasmonics in confined sub-femtoliter volumes for nucleation, polymerization or crystal growth applications.
Also freely available on ArXiv 1906.01947.
Being efficient during your PhD
As a teaser to Jerome's talk at the Institut Fresnel PhD days next Thursday, here is a video of the scientific communication expert and gourou Jean-Luc Doumont. The slides can be found on the Principiae website here, along with many other stimulating resources. Jean-Luc Doumont's book "Trees, maps and theorems" should be a must-have for every scientist.
France Bioimaging Open Day
On May 25th, we will present several demonstration experiments about manipulating light with optics. This year, we have a special celebration with the bicentenary of Augustin Fresnel's theory of diffraction, and we will be redoing the historical Fresnel Arago experiment.
Venue and schedule are detailed here.
Kaizad Rustomji awarded for the thesis prize
Our coworker Kaizad Rustomji recently got awarded the thesis prize of the Doctoral School "Physics and Sciences of the Matter" for his PhD work. Congratulations Kaizad for this well-deserved prize!
You can read more about Kaizad's work here.
Meanwhile in the lab
OK, there's not been much activity on this webpage for the last few weeks, but that's because we're preparing the next supercool set of scientific papers. Stay tuned for more exciting results soon!
