News

We noticed some unexpected result specific to QD substrates in PCAs and today the paper has come out in Journal of Selected Topics in Quantum Electronics: Enhanced THz Generation From Interdigitated Quantum Dot Based Photoconductive Antenna Operating in a Quasi-ballistic Regime

New large topical review paper comes out in Progress in Quantum Electronics! Edge emitting mode-locked quantum dot lasers We review and draw perspectives for ultrafast compact semiconductor lasers. I’d like to thank my colleagues for the opportunity to drop in some of my thoughts.

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.

Multipulse Terahertz Spectroscopy Unveils Hot Polaron Photoconductivity Dynamics in Metal-Halide Perovskites is finally online in JPCLett!

I like when the name of the paper serves as an abstract.

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.

https://arxiv.org/abs/2106.15967

#thz #thzdoesitbetter

A book chapter Optical nanoantennas for enhanced THz emission in the Nanoantennas and Plasmonics: Modelling, design and fabrication is out now!

Kinetic modelling of intraband carrier relaxation in bulk and nanocrystalline lead-halide perovskites has been accepted for Physical Chemistry Chemical Physics.