title: Purcell enhancement of spontaneous emission from quantum cascades inside mirror-grating metal cavities at THz frequencies.
abstract: 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.
authors.affiliation: CNRS/LPN, Laboratoire de Photonique et de Nanostructures, Route de Nozay, 91460 Marcoussis, France.
authors.forename: Yanko
authors.initials: Y
authors.lastname: Todorov
authors.forename: Isabelle
authors.initials: I
authors.lastname: Sagnes
authors.forename: Izo
authors.initials: I
authors.lastname: Abram
authors.forename: Christophe
authors.initials: C
authors.lastname: Minot