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Applied Physics B 06/2012; 107(3):717. · 2.19 Impact Factor
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ABSTRACT: We report experimental results of two room-temperature single photon sources with definite polarization based on emitters
embedded in either cholesteric or nematic liquid crystal hosts. In the first case, a cholesteric 1-D photonic bandgap microcavity
provides circular polarization of definite handedness of single photons from single colloidal semiconductor quantum dots (nanocrystals).
In these experiments, the spectral position of the quantum dot fluorescence maximum is at the bandedge of a photonic bandgap
structure. The host does not destroy fluorescence antibunching of single emitters. In the second case, photons with definite
linear polarization are obtained from single dye molecules doped in a planar-aligned nematic liquid crystal host. The combination
of sources with definite linear and circular polarization states of single photons can be used in a practical implementation
of the BB84 quantum key distribution protocol.
Optics and Spectroscopy 04/2012; 108(3):417-424. · 0.61 Impact Factor
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ABSTRACT: We report the first, to the best of our knowledge, experiment on the separation of the microscopic cascaded contribution to the fifth-order nonlinear susceptibility, which comes from the third-order microscopic hyperpolarizability.
Lasers and Electro-Optics, 2009 and 2009 Conference on Quantum electronics and Laser Science Conference. CLEO/QELS 2009. Conference on; 07/2009
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ABSTRACT: A review of current fiber-based technologies capable of producing slow-light effects is presented, with emphasis on the applicability of these technologies to telecommunications. We begin with a review of the basic concepts of phase velocity, group velocity, and group delay. We then present a survey of some of the figures of merit used to quantify the engineering properties of slow-light systems. We also present a description of several of the physical processes that are commonly used to induce a slow-light effect. Finally, a review of some recent advances in this field is presented.
Journal of Lightwave Technology 01/2009; · 2.78 Impact Factor
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ABSTRACT: CdSe/PbSe single quantum dots were doped into chiral-photonic-bandgap cholesteric microcavities for visible/telecom wavelengths. High-purity circularly polarized fluorescence of definite handedness from single quantum dots was observed for the first time because of microcavity spiral structure.
Lasers and Electro-Optics, 2008 and 2008 Conference on Quantum Electronics and Laser Science. CLEO/QELS 2008. Conference on; 06/2008
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ABSTRACT: In this paper, we report experimental results of a novel SPS on demand based on a single CdSe QD suspended in a liquid crystal host self-assembled in a 1D chiral photonic bandgap structure. This structure provides not only spontaneous emission enhancement and a diminishing of the fluorescence lifetime, but also circular polarization of definite handedness even for emitters without a dipole moment. 1D chiral photonic bandgap structures possess an advantage over conventional 1D photonic bandgap technologies. Because the refractive index n varies gradually in chiral structures rather than abruptly, there are no losses into the waveguide modes, which arise from total internal reflection at the border between two consecutive layers with different n. We report here for the first time fluorescence antibunching of a QD doped in a liquid crystal photonic bandgap material. Earlier we reported both fluorescence antibunching and deterministic polarization of dye fluorescence in aligned liquid crystal hosts.
Lasers and Electro-Optics, 2007 and the International Quantum Electronics Conference. CLEOE-IQEC 2007. European Conference on; 07/2007
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ABSTRACT: We demonstrated for the first time to our knowledge deterministically polarized fluorescence from single dye molecules. Planar aligned nematic liquid crystal hosts provide deterministic alignment of single dye molecules in a preferred direction.
Lasers and Electro-Optics, 2006 and 2006 Quantum Electronics and Laser Science Conference. CLEO/QELS 2006. Conference on; 06/2006
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R.W. Boyd
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ABSTRACT: This study investigates slow light in bulk materials and optical fibers. Progress in developing new slow-light techniques and applications are also presented. Slow light techniques hold great promise for applications in telecom and quantum information processing.
Optical Fiber Communication Conference, 2006 and the 2006 National Fiber Optic Engineers Conference. OFC 2006; 04/2006
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ABSTRACT: We study propagation of light pulses and modulation in an Er-doped fiber in the regimes of anomalously slow and superluminal group velocities. The pulses experience either delay or advancement depending on the pump power.
Quantum Electronics and Laser Science Conference, 2005. QELS '05; 06/2005
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ABSTRACT: We show that there are no fundamental limits to the maximum time delay that can be achieved for pulses propagating through slow-light media, thus suggesting the importance of slow-light methods for practical applications.
Quantum Electronics and Laser Science Conference, 2005. QELS '05; 06/2005
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ABSTRACT: We describe a scheme based on coherent Raman scattering for efficient transfer of amplitude and phase modulation from one frequency to another. Experimental results show bandwidths of at least tens of MHz and 99% fidelity.
Quantum Electronics and Laser Science Conference, 2005. QELS '05; 06/2005
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ABSTRACT: We demonstrated for the first time to our knowledge deterministically polarized fluorescence from single dye molecules. Planar aligned nematic liquid crystal hosts provide deterministic alignment of single dye molecules in a preferred direction.
Quantum Electronics and Laser Science Conference, 2005. QELS '05; 06/2005
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ABSTRACT: We study numerically Stokes pulse propagation in a continuous-wave-pumped Brillouin fiber amplifier. Time delay and pulse broadening of the Stokes pulse are studied in the small-signal and saturation regimes.
Quantum Electronics and Laser Science Conference, 2005. QELS '05; 06/2005
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ABSTRACT: We observe splitting of the modes in a coupled-fiber-ring resonator system. This splitting leads to a greatly enhanced transmission (cancellation of absorption) on resonance. We show the analogies between this effect and classical electromagnetically induced transparency.
Optical Fiber Communication Conference, 2005. Technical Digest. OFC/NFOEC; 04/2005
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Quantum Electronics Conference, 2005. International; 02/2005
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ABSTRACT: An overview of recent research aimed at controlling the propagation velocity of light pulses through material systems is presented. Most of the research involves two basic approaches. One approach is to make use of quantum coherence effects, such as electromagnetically induced transparency or coherent population oscillations, to modify the material response at an atomic level. Another approach is to form artificial material, such as photonic crystals, that possess strong dispersive properties which lead to a large modification to the group velocity. Both of these approaches have been successfully pursued in recent years.
Lasers and Electro-Optics Society, 2004. LEOS 2004. The 17th Annual Meeting of the IEEE; 12/2004
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ABSTRACT: Slow and superluminal group velocities can be observed in any material that has large normal or anomalous dispersion. While this fact has been known for more than a century, recent experiments have shown that the dispersion can be very large without dramatically deforming a pulse. As a result, the significance and nature of pulse velocity is being reevaluated. In this review, we discuss some of the current techniques used for generating ultra-slow, superluminal, and even stopped light. While ultra-slow and superluminal group velocities have been observed in complicated systems, from an applications point of view it is highly desirable to do have this done in a solid that can operate at room temperature. We describe how coherent population oscillations can produce ultra-slow and superluminal light under these conditions.
Journal of Physics Condensed Matter 11/2004; 16(46):R1321. · 2.55 Impact Factor
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ABSTRACT: We report on the enhancement of linear and nonlinear phase sensitivity in a 10 micron sized microring resonator. The increased dispersive and nonlinear properties can be used for optical switching and exotic nonlinear optical pulse propagation on a chip.
Biophotonics/Optical Interconnects and VLSI Photonics/WBM Microcavities, 2004 Digest of the LEOS Summer Topical Meetings; 07/2004
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ABSTRACT: We present the results of an experimental investigation of the transfer characteristics of a fiber ring resonator for various values of the resonator finesse. In particular, we measure the spectral dependence of the intensity transmission and the induced phase shift in the undercoupled, critically coupled, and overcoupled regimes. We also demonstrate tunable optical (true time) group delay via a fiber ring resonator and show that a high finesse is unnecessary. Our laboratory results are in excellent agreement with theoretical predictions.
IEEE Journal of Quantum Electronics 07/2004; · 1.88 Impact Factor
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ABSTRACT: We consider the effect of large normal or anomalous dispersion on the information velocity. We also experimentally study how pulse shapes are distorted as the pulse bandwidth becomes comparable to the region of steep dispersion
Quantum Electronics Conference, 2004. (IQEC). International; 06/2004
