62 research outputs found
Photonic Crystal Nanobeam Cavity Strongly Coupled to the Feeding Waveguide
A deterministic design of an ultrahigh Q, wavelength scale mode volume
photonic crystal nanobeam cavity is proposed and experimentally demonstrated.
Using this approach, cavities with Q>10^6 and on-resonance transmission T>90%
are designed. The devices fabricated in Si and capped with low-index polymer,
have Q=80,000 and T=73%. This is, to the best of our knowledge, the highest
transmission measured in deterministically designed, wavelength scale high Q
cavities
Response to high-dose dexamethasone for acquired pure red cell aplasia following ABO-mismatched allogeneic stem cell transplantation
This article does not have an abstract
Integrated TiO2 resonators for visible photonics
We demonstrate waveguide-coupled titanium dioxide (TiO2) racetrack resonators
with loaded quality factors of 2x10^4 for the visible wavelengths. The
structures were fabricated in sputtered TiO2 thin films on oxidized silicon
substrates using standard top-down nanofabrication techniques, and passively
probed in transmission measurements using a tunable red laser. Devices based on
this material could serve as integrated optical elements as well as passive
platforms for coupling to visible quantum emitters.Comment: 4 pages, 3 figure
Difference-frequency generation with quantum-limited efficiency in triply-resonant nonlinear cavities
We present a comprehensive study of second-order nonlinear difference
frequency generation in triply resonant cavities using a theoretical framework
based on coupled-mode theory. We show that optimal quantum-limited conversion
efficiency can be achieved at any pump power when the powers at the pump and
idler frequencies satisfy a critical relationship. We demonstrate the existence
of a broad parameter range in which all triply-resonant DFG processes exhibit
monostable conversion. We also demonstrate the existence of a
geometry-dependent bistable region.Comment: 10 pages, 3 figure
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