Purcell enhancement of spontaneous emission from quantum cascades inside mirror-grating metal cavities at THz frequencies.
Quantum cascade devices processed into double metal cavities with subwavelength thickness and a grating on top are studied at terahertz frequencies. The power extracted from the devices as a function of the device thickness and the grating period is analyzed owing to electrodynamical modeling of dipole emission based on a modal method in multilayer systems. The experimental data thus reveal a strong Purcell enhancement, with Purcell factors up to approximately 50.
Todorov
Yanko
Y
CNRS/LPN, Laboratoire de Photonique et de Nanostructures, Route de Nozay, 91460 Marcoussis, France.
Sagnes
Isabelle
I
Abram
Izo
I
Minot
Christophe
C