2,825 research outputs found
Photon blockade in a photonic crystal cavity with a strongly coupled quantum dot
The strong coupling regime between a single emitter and the mode of an optical resonator allows for nonlinear optics phenomena at extremely low light intensities. Down to the single photon level, extreme nonlinearities can be observed, where the presence of a single photon inside the resonator either blocks or enhances the probability of subsequent photons entering the resonator. In this paper we experimentally show the existence of these phenomena, named photon blockade and photon induced tunneling, in a solid state system composed of a photonic crystal cavity with a strongly coupled quantum dot
Global atmospheric sampling program
Automated instruments were installed on a commercial B-747 aircraft, during the program, to obtain baseline data and to monitor key atmospheric constituents associated with emissions of aircraft engines in order to determine if aircraft are contributing to pollution of the upper atmosphere. Data thus acquired on a global basis over the commercial air routes for 5 to 10 years will be analyzed. Ozone measurements in the 29,000 to 45,000 foot altitude were expanded over what has been available from ozonesondes. Limited aerosol composition measurements from filter samples show low levels of sulfates and nitrates in the upper troposphere. Recently installed instruments for measurement of carbon monoxide and condensation nuclei are beginning to return data
Photonic crystal chips for optical interconnects and quantum information processing
We have recently demonstrated a number of functional photonic crystals devices and circuits, including an ultrafast, room temperature, low threshold, nanocavity laser with the direct modulation speed approaching 1 THz, an all-optical switch controlled with 60 fJ pulses and with the speed exceeding 200Hz, and a local, reversible tuning of individual quantum dots on a photonic crystal chip by up to 1.8nm, which was then used to tune single quantum dots into strong coupling with a photonic crystal cavity and to achieve a giant optical nonlinearity
Theory of Pump Depletion and Spike Formation in Stimulated Raman Scattering
By using the inverse spectral transform, the SRS equations are solved and the
explicit output data is given for arbitrary laser pump and Stokes seed profiles
injected on a vacuum of optical phonons. For long duration laser pulses, this
solution is modified such as to take into account the damping rate of the
optical phonon wave. This model is used to interprete the experiments of Druhl,
Wenzel and Carlsten (Phys. Rev. Lett., (1983) vol. 51, p. 1171), in particular
the creation of a spike of (anomalous) pump radiation. The related nonlinear
Fourier spectrum does not contain discrete eigenvalue, hence this Raman spike
is not a soliton.Comment: LaTex file, includes two figures in LaTex format, 9 page
Quantum dots in photonic crystal cavities
During the past two decades, the development of micro- and nano-fabrication technologies
has positively impacted multiple areas of science and engineering. In the photonics community,
these technologies had numerous early adopters, which led to photonic devices that
exhibit features at the nano-scale and operate at the most fundamental level of light–matter
interaction [28, 39, 18, 29]. One of the leading platforms for these types of devices is
based on gallium arsenide (GaAs) planar photonic crystals (PC) with embedded indium
arsenide (InAs) quantum dots (QDs). The PC architecture is advantageous because it
enables monolithic fabrication of photonic networks for efficient routing of light signals
of the chip [26]. At the same time, PC devices have low loss and ultra-small optical
mode volumes, which enable strong light–matter interactions. The InAs quantum dots
are well suited for quantum photonic applications because they have excellent quantum
efficiencies, large dipole moments, and a variety of quantum states that can be optically
controlled [24, 3]
P02.185. The effects of tactile massage (TM) on blood pressure, heart rate and blood glucose in a sample of women suffering from primary insomnia
The overall objective of this pilot study was to study the direct effects of tactile massage (TM) on blood pressure, heart rate and blood glucose in a sample of women suffering from primary insomniaThe study had an experimental prospective design, with a total of 10 women (mean age; 53 years, ±5.4). The participants underwent TM twice a week for six weeks resulting in a total of 120 treatments. For short term effects, systolic and diastolic blood pressure, heartrate and blood glucoses were assessed by the therapist before and after each treatment. Long term assessments were made at baseline, at week 7, and at week 13.As a short term result after the treatment with TM, the participants reached a statistically significant reduction of; systolic blood pressure (-5.5 mmHg, ± 5.0), diastolic blood pressure (-2.0 mmHg, ± 4.4), Heartrate (-5.1 beats per minute, ± 3.4) and blood glucose (-0.2 mmol, ± 0.5). No long term effects with respect to the studied variables can be observed.In summary, we have shown in a normotensive but highly stressed sample of women, that TM has beneficiary effects on parameters of stress and cardiovascular function. In total, 120 TM treatments was analyzed with respect to the objective of the study, but in order to more understand the practical effects, and to more deeply evaluate TM’s place in the modalities of stress reduction, we recommend further studies with larger samples
A bright nanowire single photon source based on SiV centers in diamond
The practical implementation of many quantum technologies relies on the
development of robust and bright single photon sources that operate at room
temperature. The negatively charged silicon-vacancy (SiV-) color center in
diamond is a possible candidate for such a single photon source. However, due
to the high refraction index mismatch to air, color centers in diamond
typically exhibit low photon out-coupling. An additional shortcoming is due to
the random localization of native defects in the diamond sample. Here we
demonstrate deterministic implantation of Si ions with high conversion
efficiency to single SiV- centers, targeted to fabricated nanowires. The
co-localization of single SiV- centers with the nanostructures yields a ten
times higher light coupling efficiency than for single SiV- centers in bulk
diamond. This enhanced photon out-coupling, together with the intrinsic
scalability of the SiV- creation method, enables a new class of devices for
integrated photonics and quantum science.Comment: 15 pages, 5 figure
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