32 research outputs found
Floquet control of optomechanical bistability in multimode systems
Cavity optomechanical systems enable fine manipulation of nanomechanical
degrees of freedom with light, adding operational functionality and impacting
their appeal in photonic technologies. We show that distinct mechanical modes
can be exploited with a temporally modulated laser drive to steer between
bistable steady states induced by changes of cavity radiation pressure. We
investigate the influence of thermo-optic nonlinearity on these Floquet
dynamics and find that it can inhibit or enhance the performance of the
coupling mechanism in contrast to their often performance limiting character.
Our results provide new techniques for the characterization of thermal
properties and the control of optomechanical systems in sensing and
computational application
Ultra-low threshold polariton lasing in photonic crystal cavities
The authors show clear experimental evidence of lasing of exciton polaritons
confined in L3 photonic crystal cavities. The samples are based on an InP
membrane in air containing five InAsP quantum wells. Polariton lasing is
observed with thresholds as low as 120 nW, below the Mott transition, while
conventional photon lasing is observed for a pumping power one to three orders
of magnitude higher.Comment: 4 pages, 3 figure
Thermal Excitation of Broadband and Long-range Surface Waves on SiO 2 Submicron Films
We detect thermally excited surfaces waves on a submicron SiO 2 layer,
including Zenneck and guided modes in addition to Surface Phonon Polaritons.
The measurements show the existence of these hybrid thermal-electromagnetic
waves from near-(2.7 m) to far-(11.2 m) infrared. Their propagation
distances reach values on the order of the millimeter, several orders of
magnitude larger than on semi-infinite systems. These two features, spectral
broadness and long range propagation, make these waves good candidates for
near-field applications both in optics and thermics due to their dual nature.Comment: Applied Physics Letters, American Institute of Physics, 201
Ultra-low-noise Microwave to Optics Conversion in Gallium Phosphide
Mechanical resonators can act as excellent intermediaries to interface single
photons in the microwave and optical domains due to their high quality factors.
Nevertheless, the optical pump required to overcome the large energy difference
between the frequencies can add significant noise to the transduced signal.
Here we exploit the remarkable properties of thin-film gallium phosphide to
demonstrate on-chip microwave-to-optical conversion, realised by piezoelectric
actuation of a Gigahertz-frequency optomechanical resonator. The large
optomechanical coupling and the suppression of two-photon absorption in the
material allows us to operate the device at optomechanical cooperativities
greatly exceeding one, and, when using a pulsed upconversion pump, induce less
than one thermal noise phonon. We include a high-impedance on-chip matching
resonator to mediate the mechanical load with the 50-Ohm source. Our results
establish gallium phosphide as a versatile platform for ultra-low-noise
conversion of photons between microwave and optical frequencies
Room temperature spontaneous emission enhancement from quantum dots in photonic crystal slab cavities in the telecommunications C-band
We report on the control of the spontaneous emission dynamics from InAsP
self-assembled quantum dots emitting in the telecommunications C-band and
weakly coupled to the mode of a double heterostructure cavity etched on a
suspended InP membrane at room temperature. The quality factor of the cavity
mode is 44x10^3 with an ultra-low modal volume of the order of 1.2 lambda/n)^3,
inducing an enhancement of the spontaneous emission rate of up a factor of 2.8
at 300 K