Lowering the excitation threshold of a random laser using the dynamic scattering states of an organosiloxane smectic A liquid crystal
Stephen M. Morris, Damian J. Gardiner, Malik M. Qasim, Philip J. W. Hands, Timothy D. Wilkinson et al.
Smectic A liquid crystals, based upon molecular structures that consist of combined siloxane and mesogenic moieties, exhibit strong multiple scattering of light with and without the presence of an electric field. This paper demonstrates that when one adds a laser dye to these compounds it is possibl ... [J. Appl. Phys. 111, 033106 (2012)] published Fri Feb 10, 2012.
Bloch surface waves-controlled fluorescence emission: Coupling into nanometer-sized polymeric waveguides
Mirko Ballarini, Francesca Frascella, Emanuele Enrico, Pietro Mandracci, Natascia De Leo et al.
The lateral confinement of Bloch surface waves on a patterned multilayer is investigated by means of leakage radiation microscopy (LRM). Arrays of nanometric polymeric waveguides are fabricated on a proper silicon-nitride/silicon-oxide multilayer grown on a standard glass coverslip. By exploiting th ... [Appl. Phys. Lett. 100, 063305 (2012)] published Fri Feb 10, 2012.
Half-harmonic Kelvin probe force microscopy with transfer function correction
Senli Guo, Sergei V. Kalinin, and Stephen Jesse
An approach for surface potential imaging based on half-harmonic band excitation (BE) in Kelvin probe force microscopy is demonstrated. Using linear and half-harmonic BE enables quantitative correction of the cantilever transfer function. Half-harmonic band excitation Kelvin probe force microscopy ( ... [Appl. Phys. Lett. 100, 063118 (2012)] published Fri Feb 10, 2012.
Mechanically compliant grating reflectors for optomechanics
Utku Kemiktarak, Michael Metcalfe, Mathieu Durand, and John Lawall
We demonstrate micromechanical reflectors with a reflectivity as large as 99.4% and a mechanical quality factor Q as large as 7.8 x 10 for optomechanical applications. The reflectors are silicon nitride membranes patterned with sub-wavelength grating structures, obviating the need for the many die ... [Appl. Phys. Lett. 100, 061124 (2012)] published Fri Feb 10, 2012.
Enhanced spontaneous emission from quantum dots in short photonic crystal waveguides
Thang Ba Hoang, Johannes Beetz, Leonardo Midolo, Matthias Skacel, Matthias Lermer et al.
We report a study of the quantum dot (QD) emission in short photonic crystal waveguides. We observe that the quantum dot photoluminescence intensity and decay rate are strongly enhanced when the emission energy is in resonance with Fabry-Perot (FP) cavity modes in the slow-light regime of the disper ... [Appl. Phys. Lett. 100, 061122 (2012)] published Fri Feb 10, 2012.
Virtual ghost imaging through turbulence and obscurants using Bessel beam illumination
Ronald E. Meyers, Keith S. Deacon, Arnold D. Tunick, and Yanhua Shih
We experimentally demonstrate a single sensor virtual ghost imaging (VGI) configuration that uses the physics of nearly diffraction free light sources to penetrate partially obscuring media or turbulent media and generate images of remote opaque objects. Randomly displaced nearly diffraction free Be ... [Appl. Phys. Lett. 100, 061126 (2012)] published Fri Feb 10, 2012.
Directional waveguide coupling from a wavelength-scale deformed microdisk laser
Brandon Redding, Li Ge, Glenn S. Solomon, and Hui Cao
We demonstrate uni-directional evanescent coupling of lasing emission from a wavelength-scale deformed microdisk to a waveguide. This is attributed to the Goos-Hanchen shift and Fresnel filtering effect that result in a spatial separation of the clockwise (CW) and counter-clockwise (CCW) propagating ... [Appl. Phys. Lett. 100, 061125 (2012)] published Fri Feb 10, 2012.
Periodically focused modes in chains of dielectric spheres
Arash Darafsheh and Vasily N. Astratov
We show that, theoretically, Brewster angle conditions for transverse magnetic polarized rays can be periodically reproduced in chains of spheres with index n = sqrt(3) giving rise to lossless periodically focused modes with 2D period, where D is the sphere diameter. Using ray tracing for a spherica ... [Appl. Phys. Lett. 100, 061123 (2012)] published Fri Feb 10, 2012.
Monitoring stimulated emission at the single-photon level in one-dimensional atoms
D. Valente, S. Portolan, G. Nogues, J. P. Poizat, M. Richard et al.
We theoretically investigate signatures of stimulated emission at the single-photon level for a two-level atom interacting with a one-dimensional light field. We consider the transient regime where the atom is initially excited, and the steady-state regime where the atom is continuously driven with ... [Phys. Rev. A 85, 023811 ] published .
Resonance-fluorescence-localization microscopy with subwavelength resolution
Zeyang Liao, M. Al-Amri, and M. Suhail Zubairy
We evaluate the resonance-fluorescence spectrum of a bunch of two-level atoms driven by a gradient coherent laser field. The result shows that we can determine the positions of atoms from the spectrum even when the atoms locate within the subwavelength range and the dipole-dipole interaction is sign ... [Phys. Rev. A 85, 023810 ] published .
Quantum theory analysis of triple photons generated by a chi process
A. Dot, A. Borne, B. Boulanger, K. Bencheikh, and J. A. Levenson
We present a quantum theoretical analysis of triple photons generated by a phase-matched third-order nonlinear process in a KTP crystal in a weak-interaction regime. We show that the quantum properties of the triple photons can be brought to light through optical second- and third-order sum frequenc ... [Phys. Rev. A 85, 023809 ] published .
Proposal for isolated-attosecond-pulse generation in the multicycle regime through modulation of the carrier wave
Yang Xiang, Yueping Niu, and Shangqing Gong
An intuitive physical mechanism for isolated-attosecond-pulse generation in a multicycle pulse regime is proposed. We suggest that the continuum spectra of the high-order harmonics can be controlled through the modulation of carrier wave, while keeping the multicycle envelope unchanged approximately ... [Phys. Rev. A 85, 023808 ] published .
Surface plasmon resonance-enabled antibacterial digital versatile discs
Xuan Dou, Pei-Yu Chung, Peng Jiang, and Jianli Dai
We report the achievement of effective sterilization of exemplary bacteria including Escherichia coli and Geobacillus stearothermophilus spores on a digital versatile disc (DVD). The spiral arrangement of aluminum-covered pits generates strong surface plasmon resonance (SPR) absorption of near-infra ... [Appl. Phys. Lett. 100, 063702 (2012)] published Thu Feb 9, 2012.
Manifestation of quantum disordered wave functions with weak localization from conical second harmonic generation in ferroelectric crystal
H. H. Yu, H. J. Zhang, Z. P. Wang, H. H. Xu, Y. C. Wang et al.
The spatial structure of two-dimensional quantum disordered wave functions with weak localization (WL) is experimentally observed using a calcium barium niobate CaBaNbO (CBN-28) ferroelectric crystal illuminated by a pulsed laser beam. Non-collinear phase-matching in CBN-28 produces conical second h ... [Appl. Phys. Lett. 100, 061119 (2012)] published Thu Feb 9, 2012.
Integrability and Conservation Laws for the Nonlinear Evolution Equations of Partially Coherent Waves in Noninstantaneous Kerr Media
T. Hansson, M. Lisak, and D. Anderson
It is shown that the evolution equations describing partially coherent wave propagation in noninstantaneous Kerr media are integrable and have an infinite number of invariants. A recursion relation for generating these invariants is presented, and it is demonstrated how to express them in the cohere ... [Phys. Rev. Lett. 108, 063901 ] published .
Experimental Estimate of a Classicality Witness via a Single Measurement
G. H. Aguilar, O. Jimenez Farias, J. Maziero, R. M. Serra, P. H. Souto Ribeiro et al.
The perception that quantum correlations can still appear in separable states has opened exciting new possibilities regarding their use as a resource in quantum information science. Quantifying such quantum correlations involves the complete knowledge of the system's state and numerical optimization ... [Phys. Rev. Lett. 108, 063601 ] published .
Extremal transmission through a microwave photonic crystal and the observation of edge states in a rectangular Dirac billiard
S. Bittner, B. Dietz, M. Miski-Oglu, and A. Richter
This paper presents experimental results on properties of waves propagating in an unbounded and a bounded photonic crystal consisting of metallic cylinders that are arranged in a triangular lattice. First, we present transmission measurements of plane waves traversing a photonic crystal. The experim ... [Phys. Rev. B 85, 064301 ] published .
Deducing radiation pressure on a submerged mirror from the Doppler shift
Masud Mansuripur
Radiation pressure on a flat mirror submerged in a transparent liquid depends not only on the refractive index n of the liquid but also on the phase angle psi of the Fresnel reflection coefficient of the mirror, which could be anywhere between 0 and 180. Depending on the value of psi, the momentum p ... [Phys. Rev. A 85, 023807 ] published .
Remote lasing in air by recombination and electron impact excitation of molecular nitrogen
Joseph Penano, Phillip Sprangle, Bahman Hafizi, Daniel Gordon, Richard Fernsler et al.
We analyze and simulate the physical mechanisms for a remote atmospheric lasing configuration which utilizes a combination of an ultrashort pulse laser to form a plasma filament of seed electrons, and a heater beam to heat the seed electrons. Nitrogen molecules are excited by electron impact and rec ... [J. Appl. Phys. 111, 033105 (2012)] published Wed Feb 8, 2012.
Analysis of temporal jitter in a copper vapor laser system
D. Durga Praveen Kumar, L. M. Gantayet, Sunita Singh, A. S. Rawat, Paramjit Rana et al.
Temporal jitter in a magnetic pulse compression based copper vapor laser (CVL) system is analyzed by considering ripple present in the input dc power supply and ripple present in the magnetic core resetting power supply. It is shown that the jitter is a function of the ratio of operating voltage to ... [Rev. Sci. Instrum. 83, 025105 (2012)] published Wed Feb 8, 2012.
Symmetry-breaking diffraction and dynamic self-trapping in optically induced hexagonal photonic lattices
Sheng Liu, Yi Hu, Peng Zhang, Xuetao Gan, Cibo Lou et al.
We demonstrate both experimentally and numerically linear symmetry-breaking diffraction and nonlinear dynamic self-trapping of an optical beam in hexagonal photonic lattices. We show that a stripe multivortex beam undergoes asymmetric linear diffraction, but evolves into a moving self-trapped beam u ... [Appl. Phys. Lett. 100, 061907 (2012)] published Wed Feb 8, 2012.
Erratum: Controlling the stimulated Brillouin scattering of self-focusing nanosecond laser pulses in silica glasses [Phys. Rev. A 83, 063829 (2011)]
Sarah Mauger, Luc Berge, and Stefan Skupin
Abstract not available. [Phys. Rev. A 85, 029902 ] published .
Back-reaction effects of quantum vacuum in cavity quantum electrodynamics
I. Carusotto, S. De Liberato, D. Gerace, and C. Ciuti
We theoretically study an optical system in which the back-reaction of quantum vacuum manifests itself as a sizable suppression of the absorption by a three-level emitter embedded in an optical cavity. A theoretical model including the anti-rotating-wave terms of the light-matter interaction Hamilto ... [Phys. Rev. A 85, 023805 ] published .
Number-phase Wigner representation for scalable stochastic simulations of controlled quantum systems
M. R. Hush, A. R. R. Carvalho, and J. J. Hope
Simulation of conditional master equations is important to describe systems under continuous measurement and for the design of control strategies in quantum systems. For large bosonic systems, such as Bose-Einstein condensates and atom lasers, full quantum-field simulations must rely on scalable sto ... [Phys. Rev. A 85, 023607 ] published .
Identifying and evaluating organic nonlinear optical materials via molecular moments
A. P. Higginbotham, J. M. Cole, M. A. Blood-Forsythe, and D. D. Hickstein
We demonstrate how to appropriately estimate the zero-frequency (static) hyperpolarizability of an organic molecule from its charge distribution, and we explore applications of these estimates for identifying and evaluating new organic nonlinear optical (NLO) materials. First, we calculate hyperpola ... [J. Appl. Phys. 111, 033512 (2012)] published Tue Feb 7, 2012.
Highly tunable whispering gallery mode semiconductor lasers with controlled absorber
A. N. Baranov, G. Boissier, R. Teissier, A. M. Monakhov, V. V. Sherstnev et al.
Tunable semiconductor lasers with controlled absorber based on GaInAsSb/GaAlAsSb quantum well heterostructure was fabricated and experimentally studied. The emission wavelength of these lasers shifts from 2.24 to 2.28 [mu]m when the bias on the control contact decreases from the voltage equal to tha ... [Appl. Phys. Lett. 100, 061112 (2012)] published Tue Feb 7, 2012.
Resonant modulational instability and self-induced transmission effects in semiconductors: Maxwell-Bloch formalism
Oleksii A. Smyrnov and Fabio Biancalana
The nonlinear optical properties of semiconductors near an excitonic resonance are investigated theoretically by using the macroscopic J model [Ostreich and Knorr, Phys. Rev. B 48, 17811 (1993); and ibid. 50, 5717 (1994)] based on the microscopic semiconductor Bloch equations. These nonlinear prop ... [Phys. Rev. B 85, 075201 ] published .
Laser and focused ion beam combined machining for micro dies
Y. Yoshida, W. Okazaki, and T. Uchida
We have developed a laser and focused ion beam (FIB) compound process for press mold dies of a micro lens array (MLA) and a micro needle array (MNA) in a glassy carbon (GC). The press mold die of the MLA was roughly fabricated by UV-YAG laser. After this process, we finished this surface by scanning ... [Rev. Sci. Instrum. 83, 02B901 (2012)] published Mon Feb 6, 2012.
Laser ion source development at Holifield Radioactive Ion Beam Facility
Y. Liu, T. Gottwald, C. C. Havener, J. Y. Howe, J. Kiggans et al.
This report describes the efforts made to develop a resonant-ionization laser ion source based on tunable Ti:sapphire lasers for nuclear physics and astrophysics research at Holifield Radioactive Ion Beam Facility. Three Ti:sapphire lasers have been upgraded with individual pump lasers to eliminate ... [Rev. Sci. Instrum. 83, 02A904 (2012)] published Mon Feb 6, 2012.
Upgrade of the resonance ionization laser ion source at ISOLDE on-line isotope separation facility: New lasers and new ion beams
V. N. Fedosseev, L.-E. Berg, D. V. Fedorov, D. Fink, O. J. Launila et al.
The resonance ionization laser ion source (RILIS) produces beams for the majority of experiments at the ISOLDE on-line isotope separator. A substantial improvement in RILIS performance has been achieved through a series of upgrade steps: replacement of the copper vapor lasers by a Nd:YAG laser; repl ... [Rev. Sci. Instrum. 83, 02A903 (2012)] published Mon Feb 6, 2012.
Effectiveness of frequency mapping on 28 nm device broken scan chain failures
S. H. Goh, Yan Pan, G. F. You, Y. H. Chan, He ran et al.
Frequency mapping methodology is an effective diagnostic tool for detection of manufacturing defects in scan chains. It analyses reflected laser modulations from toggling scan cells to localize defective scan path or scan cell. In this paper, we demonstrate experimentally that the use of solid immer ... [Rev. Sci. Instrum. 83, 023702 (2012)] published Mon Feb 6, 2012.
Spontaneous emission spectra and quantum light-matter interactions from a strongly coupled quantum dot metal-nanoparticle system
C. Van Vlack, Philip Trost Kristensen, and S. Hughes
We investigate the quantum optical properties of a quantum-dot dipole emitter coupled to a finite-size metal nanoparticle using a photon Green-function technique that rigorously quantizes the electromagnetic fields. We first obtain pronounced Purcell factors and photonic Lamb shifts for both a 7- an ... [Phys. Rev. B 85, 075303 ] published .
Optomechanical cooling of levitated spheres with doubly resonant fields
G. A. T. Pender, P. F. Barker, Florian Marquardt, J. Millen, and T. S. Monteiro
Optomechanical cooling of levitated dielectric particles represents a promising new approach in the quest to cool small mechanical resonators toward their quantum ground state. We investigate two-mode cooling of levitated nanospheres in a self-trapping regime. We identify a structure of overlapping, ... [Phys. Rev. A 85, 021802 ] published .