Search results for "Purcell"
showing 4 items of 4 documents
Addressing and control of optical nanosources by integrated or fibered plasmonics
2015
Surface plasmon polariton (SPP) can confine light on subwavelength dimensions. Since they are not diffraction limited, they are of great interest for addressing and controlling optical nanosources. For example, a metal nanowire defines 1D plasmonic waveguide with a great potential for either addressing or coupling quantum emitters. Therefore, SPP opens great opportunities for integrated optical applications. However, SPP suffer from ohmic losses that jeopardize the applications of plasmonic components. In this context, we study the possibilities provided by an hybrid plasmonic-photonicstructure to couple efficiently an emitter to a fiber mode. Such a structure paves the way for fibered sing…
Excitation power dependence of the Purcell effect in photonic crystal microcavity lasers with quantum wires
2013
The Purcell effect dependence on the excitation power is studied in photonic crystal microcavity lasers embedding InAs/InP quantum wires. In the case of non-lasing modes, the Purcell effect has low dependence on the optical pumping, attributable to an exciton dynamics combining free and localized excitons. In the case of lasing modes, the influence of the stimulated emission makes ambiguous the determination of the Purcell factor. We have found that this ambiguity can be avoided by measuring the dependence of the decay time on the excitation power. These results provide insights in the determination of the Purcell factor in microcavity lasers. © 2013 AIP Publishing LLC.
Koiran ja jäniksen konnotaatiot : Roland Barthesin konnotaatiotavat Steve Purcellin Sam & Max -sarjakuvissa ja -peleissä
2010
Pro gradu -tutkielma käsittelee Roland Barthesin konnotaatiotapoja sarjakuvan ja digitaalisen pelin kontekstissa. Tutkielman kohteena on Steve Purcellin Sam & Max -sarja, joka on jatkunut 1980-luvulta nykypäivään siirtyen mediavälineestä toiseen, mutta silti alkuperäisen tekijänsä suunnittelemana. Työn aineisto käsittää alkuperäisen sarjakuvasarjan lisäksi myös vuonna 1993 julkaistun Sam & Max Hit the Road -pelin sekä 2000-luvulla julkaistun uuden pelisarjan kaksi ensimmäistä tuotantokautta. Aineisto on laaja, käsittäen yhteensä 12 peliä ja sarjakuvasarjan kokonaisuudessaan. Laajuudesta johtuen hahmojen pohjalta 1990-luvulla tehty animaatiosarja jäi tutkielman ulkopuolelle. Tutkielman analy…
Purcell Enhancement and Wavelength Shift of Emitted Light by CsPbI3 Perovskite Nanocrystals Coupled to Hyperbolic Metamaterials
2020
Manipulation of the exciton emission rate in nanocrystals of lead halide perovskites (LHPs) was demonstrated by means of coupling of excitons with a hyperbolic metamaterial (HMM) consisting of alternating thin metal (Ag) and dielectric (LiF) layers. Such a coupling is found to induce an increase of the exciton radiative recombination rate by more than a factor of three due to the Purcell effect when the distance between the quantum emitter and HMM is nominally as small as 10 nm, which coincides well with the results of our theoretical analysis. Besides, an effect of the coupling-induced long wavelength shift of the exciton emission spectrum is detected and modeled. These results can be of i…