We report on an all-optical switch that operates at low light levels. It consists of laser beams counterpropagating through a warm rubidium vapor induce off-axis optical pattern. A switching beam causes this pattern to rotate even when the power in is much lower than The observed energy density very low, suggesting might operate single-photon level with system optimization. This approach opens possibility realizing for quantum information networks and improving transparent telecommunication networks.

In this paper, we investigate slow light via stimulated Brillouin scattering (SBS) in a room temperature optical fiber that is pumped by spectrally broadened laser. Broadening the spectrum of pump field increases linewidth Deltaomega <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">p</sub> Stokes amplifying resonance, thereby increasing slow-light bandwidth. One physical bandwidth limitation occurs when becomes several times larger than frequency...

We describe a methodology to maximize slow-light pulse delay subject constraint on the allowable distortion. show that optimizing over larger number of physical variables can increase distortion-constrained delay. demonstrate these concepts by comparing optimum achievable using single Lorentzian gain line with pair closely-spaced lines. predict distortion management doublet provide approximately factor 2 in as compared single-line Experimental results employing Brillouin optical fiber...

We create optical precursors by propagating a step-modulated pulse through linear resonant dielectric absorber. The field emerging from the consists of several-nanosecond-long spike with near 100% transmission, which decays to constant value expected Beer's law. This high-transmission might be useful for imaging applications requiring penetrating radiation. compare our observations two different theories, revealing that both Sommerfeld and Brillouin precursors.

We increased the bandwidth of SBS slow light in an optical fiber to 12.6 GHz. delayed 75-ps pulses by up 47 ps and studied data pattern dependence broadband slow-light system.

Abstract We review recent theoretical and experimental efforts toward developing an all‐optical switch based on transverse optical patterns. Transverse patterns are formed when counterpropagating laser beams interact with a nonlinear medium. A perturbation, in the form of weak beam injected into medium, controls orientation generated Each state pattern is associated switch. That is, information stored state. realization this using warm rubidium vapor shows that it can be actuated by as few...

We investigate slow-light via stimulated Brillouin scattering in a room temperature optical fiber that is pumped by spectrally broadened laser. Broadening the spectrum of pump field increases linewidth $\Delta\omega_p$ Stokes amplifying resonance, thereby increasing bandwidth. One physical bandwidth limitation occurs when becomes several times larger than frequency shift $\Omega_B$ so anti-Stokes absorbing resonance cancels out substantially and hence effect. find partial overlap resonances...

We describe an experiment for generating and characterizing a beam of collimated blue light (CBL) in rubidium vapor. Two low-power, grating-feedback diode lasers, operating at 780.2 nm (5S1/2→5P3/2) 776.0 (5P3/2→5D5/2), respectively, provide step-wise excitation to the 5D excited state rubidium. Under right experimental conditions, cascade decay through 6P will yield (420-nm) with high temporal spatial coherence. investigate production under variety conditions characterize coherence spectral...

We demonstrate an all-optical switch that operates at ultra-low-light levels and exhibits several features necessary for use in optical switching networks. An input beam, wavelength $\ensuremath{\lambda}$, with energy density of ${10}^{\ensuremath{-}2}$ photons per cross section $[\ensuremath{\sigma}={\ensuremath{\lambda}}^{2}∕(2\ensuremath{\pi})]$ changes the orientation a two-spot pattern generated via parametric instability warm rubidium vapor. The is induced less than...

Displacement Talbot Lithography (DTL) has emerged as a viable technology that relies on the proven photolithography approach of semiconductor industry while offering specific, low-cost solution for large area printing periodic structures kind required waveguides. Electronic Design Automation (EDA) tools are necessary standard projection lithography approaches, and now can be used to understand DTL interactions with waveguide designs. Here, we present first results from development complete...

We report on a simple anisotropic magneto-optical trap for neutral atoms that produces large sample of cold confined in cylindrically-shaped volume with high aspect ratio (100:1). Due to the number trapped atoms, laser beams propagate along optically thick axis cool are substantially attenuated. demonstrate resulting intensity imbalance net force spatially localizes atoms. This limits both length and total Rotating cooling by small angle relative avoids problem attenuation, can be throughout...

We demonstrate that it is possible to choose an optimal signal mode for state reconstruction when performing quantum-state tomography with array detectors. The optimization done during the data analysis (i.e., after all have been collected.) develop theoretically a procedure finding satisfies criterion which quadratic in field operators; as examples we explicitly show how maximize average photon number, or amount of quadrature squeezing. experimentally technique by maximizes number...

We observe interference between the optical precursors and main signal for small depth α0 L ∼ 1, in which cannot be entirely absorbed. Since oscillates at carrier frequency of input pulse oscillate medium resonance frequency, our case dependence total transmitted field is observed as a form modulation patterns oscillating detuning frequency. To distinguish Sommerfeld Brillouin weakly dispersive off-resonance medium, we utilize asymptotic precursor theory under assumption detuning.

We have simultaneously measured the quantum states of two different spatial modes same optical beam by performing quantum-state tomography with an array detector. Both are well described coherent states, but projection signal onto local oscillator mode contains a mean 0.09 photons, while more complicated has 4.3 photons. This demonstrates that for this particular effective detection efficiency when using is over 40 times greater than single detectors.

Loading cold atoms into a hollow-core optical fiber enables all-optical switching with just several hundred photons.

Frequency modulating the pump laser in SBS slow-light delay systems increases effective Brillouin bandwidth by nearly two orders of magnitude, making fiber amplifier technique applicable to all-optical controllable Gb/s data.

Abstract The Expert Opinion is written by a distinguished scientist and presents his personal view on important relevant new results of research, highlighting their significance putting the work into perspective for broader audience. Please send comments to pss.rapid@wiley‐vch.de or author. text Andrew M. C. Dawes refers Rapid Research Letter S. Schumacher et al., published in this issue Phys. Status Solidi RRL 3 , 10 (2009). (© 2009 WILEY‐VCH Verlag GmbH &amp; Co. KGaA, Weinheim)

Metalenses are flat devices that focus and manipulate optical waves. Unlike reflective refractive optics, metalenses rely on phase shifts introduced by subwavelength metastructures. Demonstrate the cost performance impact of using manufactured metaatoms from two lithography processes to design manufacture metalenses. Design types metalenses, first type (ideal) uses an ideal made up square metaatoms. This lens is then simulated both 193nm 248nm processes. The second (manufacture-aware) a...

Current and future searches for dark matter axions, based on their resonant conversion to photons in a magnetic field, span many orders of magnitude, from the very low mass GUT-scale axion high post-inflation axion. The higher end this range, 10 GHz above is challenging conventional microwave cavity-based experiments, owing steep drop-off volume thus power with frequency. We present results first step towards tunable resonator that can be made suitably large sufficiently frequency begin...

Quantum information can be transferred from a beam of light to cloud atoms and controllably released at later time. This process forms the basis many important quantum memory devices that are fundamental future science, computing, communication. Prior experiments have stored in variety systems, including cold atom clouds, warm atomic vapor, solid state materials, optical fibers. To extend these successful investigations, goal our research program is carry out full characterization states...

Displacement Talbot Lithography (DTL) is an emerging photolithography technique for printing high-resolution periodic patterns. The image recorded through the DTL process differs from those created in projection or contact/proximity techniques, not only because it uses all longitudinal axis planes, but also way object (mask) transmission function transformed into image. We present main parameters involved modeling patterning and give examples relevant to applications such as AR/VR waveguide...