2 research outputs found
Inverse Design of Whispering-Gallery Nanolasers with Tailored Beam Shape and Polarization
Control over the shape and polarization of the beam emitted
by
a laser source is important in applications such as optical communications,
optical manipulation and high-resolution optical imaging. In this
paper, we present the inverse design of monolithic whispering-gallery
nanolasers which emit along their axial direction with a tailored
laser beam shape and polarization. We design and experimentally verify
three types of submicron cavities, each one emitting into a different
laser radiation mode: an azimuthally polarized doughnut beam, a radially
polarized doughnut beam and a linearly polarized Gaussian-like beam.
The measured output laser beams yield a field overlap with respect
to the target mode of 92%, 96%, and 85% for the azimuthal, radial,
and linearly polarized cases, respectively, thereby demonstrating
the generality of the method in the design of ultracompact lasers
with tailored beams
Waveguide Coupled Resonance Fluorescence from On-Chip Quantum Emitter
Resonantly driven quantum emitters
offer a very promising route to obtain highly coherent sources of
single photons required for applications in quantum information processing
(QIP). Realizing this for on-chip scalable devices would be important
for scientific advances and practical applications in the field of
integrated quantum optics. Here we report on-chip quantum dot (QD)
resonance fluorescence (RF) efficiently coupled into a single-mode
waveguide, a key component of a photonic integrated circuit, with
a negligible resonant laser background and show that the QD coherence
is enhanced by more than a factor of 4 compared to off-resonant excitation.
Single-photon behavior is confirmed under resonant excitation, and
fast fluctuating charge dynamics are revealed in autocorrelation g<sup>(2)</sup> measurements. The potential for triggered operation is
verified in pulsed RF. These results pave the way to a novel class
of integrated quantum-optical devices for on-chip quantum information
processing with embedded resonantly driven quantum emitters