The
Stark effect is one of the most efficient mechanisms to manipulate
many-body states in nanostructured systems. In mono- and few-layer
transition metal dichalcogenides, it has been successfully induced
by optical and electric field means. Here, we tune the optical emission
energies and dissociate excitonic states in MoSe2 monolayers
employing the 220 MHz in-plane piezoelectric field carried by surface
acoustic waves. We transfer the monolayers to high dielectric constant
piezoelectric substrates, where the neutral exciton binding energy
is reduced, allowing us to efficiently quench (above 90%) and red-shift
the excitonic optical emissions. A model for the acoustically induced
Stark effect yields neutral exciton and trion in-plane polarizabilities
of 530 and 630 × 10–5 meV/(kV/cm)2, respectively, which are considerably larger than those reported
for monolayers encapsulated in hexagonal boron nitride. Large in-plane
polarizabilities are an attractive ingredient to manipulate and modulate
multiexciton interactions in two-dimensional semiconductor nanostructures
for optoelectronic applications.
We demonstrate four wave-mixing in a triple state silicon nitride photonic molecule. Using microheaters to fine tune the resonant frequencies we can optimize the phase-matching conditions for FWM generation using a phase-coherent dual-tone pump scheme.
We present the dispersion engineering of a three-microring photonic molecule via thermo-optic effects. Despite the overall normal GVD, local regimes of normal and anomalous dispersion are tailored by fine-tuning the microcavities’ supermode frequencies.
We demonstrate degenerate optical parametric oscillation in a triple-state silicon nitride photonic molecule. DOPO is generated with a phase-coherent dual-tone pump scheme, and the phase-matching conditions are optimized by tuning the resonances with microheaters.
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