Sub-10-fs observation of bound exciton formation in organic optoelectronic devices comes out in Nature Communications. I participated in the ultrafast Pump – Probe, Pump-Push-Photocurrent and Pump-Push-Photoluminescence setup development and alignment, the fastest spectroscopic setup I ever worked with. (in absolute values – THz setups allow for Single oscillation pulses and time resolutions compared with wavelength/c).
We find that excitons created by near-absorption-edge photons are intrinsically bound states, or become such within 10 fs after excitation. Meanwhile, excitons with a modest >0.3 eV excess energy can dissociate spontaneously within 50 fs before acquiring bound character.
Design of broadband terahertz vector and vortex beams: I. Review of materials and components Describes the approaches to broadband THz vortices generation, and Design of broadband terahertz vector and vortex beams: II. Holographic assessment Shows how THz pulse time domain holography can be used to visualise the dynamics of their buildup and further propagation, check the efficiency of generators, and model the experiments before actual runs.
We determined the operational limits for the QD based photoconductive antennas and revealed they can withstand more than 1W of pump power into a single gap, without destruction.
A next step towards compact room temperature THz sources
Operation of quantum dot based terahertz photoconductive antennas under extreme pumping conditions
It’s been a while since the initiation of this research. And, finally, the paper Pseudo-anapole regime in terahertz metasurfaces comes out in Phys. Rev. B.
Many thanks to all co-authors.
New preprint with exciting results! Most experiments date back to 2019 when I was with @bakulingroup
Optical pump – infrared push – THz probe spectroscopy reveals the impact of lattice heating on the hot carriers mobility in lead halide perovskites.
Special Thanks to Dr. Thomas Hopper and Shawn Zheng for wrapping the results up into a manuscript.
This Special Issue in an open access MDPI Materials guest edited by me is dedicated to modern approaches to Terahertz metamaterials design and their applications and welcomes your manuscripts. Submission deadline is 30 June 2021.