1,721,258 research outputs found
Entangled, guided photon generation in (1+1)-dimensional photonic crystals
No full textA scheme based on photonic crystal technology is proposed as an ultrabright source of entangled photons on a miniaturized scale. The geometry consists of a multilayer microcavity, excited by a resonant pump frequency, such that the emitted photons are guided transversally to the direction of the incident pump. The entanglement occurs in direction, frequency, and polarization, and the bandwidth of the emitted photons is of the order of 1 nm. We propose a feasible design based on Al0.3Ga0.7As/Al2O3 structures and predict an emission rate 10(5) pairs per second with 100 mW pump power. These results are promising for realization of chip and future quantum computer applications
Photonic signal reflectivity and transmissivity control using a photonic band gap structure
No full textReflectivity control via second-order interaction process in one dimensional PBG structures
No full textTransit time of optical pulses propagating through a finite length medium
No full textWe present experimental and theoretical results on the transit time of optical pulses propagating through bulk media of finite length, specifically GaAs and silica. The transit time of the peak of the pulse varies with the central wavelength due to the etalon effects caused by the reflectivity at the air/medium boundaries. For transform limited optical pulses, the transit time as a function of wavelength follows the transmittance spectrum, that is, the longest transit time occurs at the transmittance maxima where the cavity dwell time is the longest and the shortest transit time occurs at the transmittance minima. The results are dramatically different for chirped pulses obtained by modulating the injection current of a diode laser. The range in the transit times for chirped pulses is a factor of four times larger compared with transform limited pulses. In addition, the transit time for chirped pulses propagating through the GaAs sample is negative at certain wavelengths. Also, the transmitted pulse is not distorted. Although modulating the injection current of a diode laser is the most common method for generating optical pulses, to our knowledge this is the first reported observation of the transit time of these chirped optical pulses propagating through a simple etalon structure
Efficient Non-Linear Phase Shifting Using a Photonic Band-Gap Structure. US patent # 6,538,794
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