7,370 research outputs found
Triangular nanobeam photonic cavities in single crystal diamond
Diamond photonics provides an attractive architecture to explore room
temperature cavity quantum electrodynamics and to realize scalable multi-qubit
computing. Here we review the present state of diamond photonic technology. The
design, fabrication and characterization of a novel triangular cross section
nanobeam cavity produced in a single crystal diamond is demonstrated. The
present cavity design, based on a triangular cross section allows vertical
confinement and better signal collection efficiency than that of slab-based
nanocavities, and eliminates the need for a pre-existing membrane. The nanobeam
is fabricated by Focused-Ion-Beam (FIB) patterning. The cavity is characterized
by a confocal photoluminescence. The modes display quality factors of Q ~220
and are deviated in wavelength by only ~1.7nm from the NV- color center zero
phonon line (ZPL). The measured results are found in good agreement with 3D
Finite-Difference-Time-Domain (FDTD) calculations. A more advanced cavity
design with Q=22,000 is modeled, showing the potential for high-Q
implementations using the triangular cavity design. The prospects of this
concept and its application to spin non-demolition measurement and quantum
computing are discussed.Comment: 18 pages,7 figure
Nonradiating Photonics with Resonant Dielectric Nanostructures
Nonradiating sources of energy have traditionally been studied in quantum
mechanics and astrophysics, while receiving a very little attention in the
photonics community. This situation has changed recently due to a number of
pioneering theoretical studies and remarkable experimental demonstrations of
the exotic states of light in dielectric resonant photonic structures and
metasurfaces, with the possibility to localize efficiently the electromagnetic
fields of high intensities within small volumes of matter. These recent
advances underpin novel concepts in nanophotonics, and provide a promising
pathway to overcome the problem of losses usually associated with metals and
plasmonic materials for the efficient control of the light-matter interaction
at the nanoscale. This review paper provides the general background and several
snapshots of the recent results in this young yet prominent research field,
focusing on two types of nonradiating states of light that both have been
recently at the center of many studies in all-dielectric resonant meta-optics
and metasurfaces: optical {\em anapoles} and photonic {\em bound states in the
continuum}. We discuss a brief history of these states in optics, their
underlying physics and manifestations, and also emphasize their differences and
similarities. We also review some applications of such novel photonic states in
both linear and nonlinear optics for the nanoscale field enhancement, a design
of novel dielectric structures with high- resonances, nonlinear wave mixing
and enhanced harmonic generation, as well as advanced concepts for lasing and
optical neural networks.Comment: 22 pages, 9 figures, review articl
Optical cavities and waveguides in hyperuniform disordered photonic solids
Using finite difference time domain and band structure computer simulations,
we show that it is possible to construct optical cavities and waveguide
architectures in hyperuniform disordered photonic solids that are unattainable
in photonic crystals. The cavity modes can be classified according to the
symmetry (monopole, dipole, quadrupole,etc.) of the confined electromagnetic
wave pattern. Owing to the isotropy of the band gaps characteristic of
hyperuniform disordered solids, high-quality waveguides with freeform
geometries (e.g., arbitrary bending angles) can be constructed that have no
analogue in periodic or quasiperiodic solids. These capabilities have
implications for many photonic applications
All-optical radiofrequency modulation of Anderson-localized modes
All-optical modulation of light relies on exploiting intrinsic material
nonlinearities. However, this optical control is rather challenging due to the
weak dependence of the refractive index and absorption coefficients on the
concentration of free carriers in standard semiconductors. To overcome this
limitation, resonant structures with high spatial and spectral confinement are
carefully designed to enhance the stored electromagnetic energy, thereby
requiring lower excitation power to achieve significant nonlinear effects.
Small mode-volume and high quality (Q)-factor cavities also offer an efficient
coherent control of the light field and the targeted optical properties. Here,
we report on optical resonances reaching Q - 10^5 induced by disorder on novel
photonic/phononic crystal waveguides. At relatively low excitation powers
(below 1 mW), these cavities exhibit nonlinear effects leading to periodic (up
to - 35 MHz) oscillations of their resonant wavelength. Our system represents a
test-bed to study the interplay between structural complexity and material
nonlinearities and their impact on localization phenomena and introduces a
novel functionality to the toolset of disordered photonics
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