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August


Investigation of Plasmonic Whispering-Gallery Mode Characteristics for the Graphene Monolayer Coated Dielectric Nanodisks

  • Weibin Qiu, Zhao Jing, Yixin Huang, Jia-Xian Wang, Qiang kan, and Jiaoqing Pan
  • received 04/22/2014; accepted 08/22/2014; posted 08/22/2014; Doc. ID 210336
  • [full text: PDF (653) KB)]
  • Abstract: In this Letter, we theoretically studied high quality (Q) factor plasmonic whispering-gallery modes (WGMs) with ultrasmall mode volumes in the graphene monolayer coated semiconductor nanodisk in mid-infrared range. The influence of the chemical potential, the relaxation time of graphene, and the radius of nanodisk on the cavity Q factor and the mode volume was numerically investigated. The numerical simulations showed that the plasmonic WGMs excited in this cavity had a deep subwavelength mode volume of and a cavity Q factor of as high as 266 at temperature lower than 250 K, and consequently a large Purcell factor higher than 10⁶ , when the chemical potential and the relaxation time was assumed to be 0.9 eV and 1.4 ps, respectively. The results provide a possible application of plasmonic WGMs in the integration of the nano-optoelectronic devices based on graphene. © 2014 Optical Society of America

Keywords (OCIS):

  • (230.5750) Optical devices : Resonators
  • (240.6680) Optics at surfaces : Surface plasmons
  • (250.5403) Optoelectronics : Plasmonics

Injection-locked operation of optically-pumped semiconductor laser

  • Yi-Ying Lai, Yevgeniy Merzlyak, Mike Yarborough, Kevin Winn, and Yushi Kaneda
  • received 07/17/2014; accepted 08/22/2014; posted 08/22/2014; Doc. ID 216769
  • [full text: PDF (406) KB)]
  • Abstract: We demonstrate a single-frequency, continuous-wave, optically-pumped semiconductor laser (OPSL) using injection-locking technique. The parameters such as output coupling, injection power and injection wavelength are investigated. With proper parameters, the output power of the injection-locked laser exceeds the output power of its free-running condition. With 1.5W of injection power from the master laser, over 9 W of output power is achieved at 1015 nm.

Keywords (OCIS):

  • (140.3520) Lasers and laser optics : Lasers, injection-locked
  • (140.3570) Lasers and laser optics : Lasers, single-mode
  • (140.5960) Lasers and laser optics : Semiconductor lasers
  • (140.7270) Lasers and laser optics : Vertical emitting lasers

High-resolution broadband terahertz spectroscopy via electronic heterodyne detection of photonically generated terahertz frequency comb

  • Michael Bakunov, Dmitry Pavelyev, and Anton Srkyl
  • received 07/11/2014; accepted 08/22/2014; posted 08/22/2014; Doc. ID 216823
  • [full text: PDF (489) KB)]
  • Abstract: We report an alternative approach to the terahertz frequency comb spectroscopy (TFCS) based on nonlinear mixing of a photonically generated terahertz pulse train with a continuous wave signal from an electronic synthesizer. A superlattice is used as a nonlinear mixer. Unlike the standard TFCS technique, this approach does not require a complex double laser system but retains the advantages of TFCS – high spectral resolution and wide bandwidth.

Keywords (OCIS):

  • (300.6190) Spectroscopy : Spectrometers
  • (300.6495) Spectroscopy : Spectroscopy, teraherz

Coupled Airy breathers

  • Rodislav Driben, Vladimir Konotop, and Torsten Meier
  • received 08/12/2014; accepted 08/22/2014; posted 08/22/2014; Doc. ID 220885
  • [full text: PDF (923) KB)]
  • Abstract: The dynamics of two component coupled Airy beams is investigated. In the linear propagation regime a complete analytic solution describes breather like propagation of the two components featuring non-diffracting self-accelerating Airy behavior. The superposition of two beams with different input properties opens the possibility to design more complex non-diffracting propagation scenarios. In the strongly nonlinear regime the dynamics remains qualitatively robust as is revealed by direct numerical simulations. Due to the Kerr effect the two beams emit solitonic breathers, whose coupling period is compatible with the remaining Airy-like beams. The results of this study are relevant for the description of photonic and plasmonic beams propagating in coupled planar waveguides as well as for birefrigent or multi-wavelengths beams.

Keywords (OCIS):

  • (050.1940) Diffraction and gratings : Diffraction
  • (190.0190) Nonlinear optics : Nonlinear optics
  • (190.3270) Nonlinear optics : Kerr effect

All-fiber pulse shortening of passively Q-switched microchip laser pulses down to sub-200 fs

  • Reinhold Lehneis, Alexander Steinmetz, Jens Limpert, and Andreas Tünnermann
  • received 07/18/2014; accepted 08/21/2014; posted 08/22/2014; Doc. ID 217114
  • [full text: PDF (948) KB)]
  • Abstract: We present an all-fiber concept which generates ultrashort pulses using a passively Q-switched microchip seed laser. A proof-of-principle configuration combines nonlinear pulse compression applying a chirped fiber-Bragg-grating, dispersion-free pulse shortening by means of a fiber-integrated spectral filtering, and a final hollow-core-fiber compression to reach the sub-200 fs pulse duration region. In a compact all-fiber pulse shortening unit initial 100 ps long microchip pulses at 1064 nm wavelength have been shortened to 174 fs and shifted to 1034 nm while preserving a high temporal quality.

Keywords (OCIS):

  • (140.3540) Lasers and laser optics : Lasers, Q-switched
  • (320.5520) Ultrafast optics : Pulse compression
  • (320.5540) Ultrafast optics : Pulse shaping

Nonlinear frequency conversion using high quality modes in GaAs nanobeam cavities

  • Sonia Buckley, Klaus Biermann, Jelena Vuckovic, Marina Radulaski, Jan Petykiewicz, and Jingyuan Linda Zhang
  • received 07/10/2014; accepted 08/21/2014; posted 08/22/2014; Doc. ID 216478
  • [full text: PDF (2022) KB)]
  • Abstract: We demonstrate the design, fabrication and characterization of nanobeam photonic crystal cavities in (111)-GaAs with multiple high Q modes, with large frequency separations (up to 740 nm in experiment, i.e., a factor of 1.5 and up to an octave in theory). Such structures are crucial for efficient implementation of nonlinear frequency conversion. Here, we employ them to demonstrate sum frequency generation from 1300 nm and 1950 nm to 780 nm. These wavelengths are particularly interesting for quantum frequency conversion between Si vacancy centers in diamond and the fiber optic network.

Keywords (OCIS):

  • (190.4390) Nonlinear optics : Nonlinear optics, integrated optics
  • (350.4238) Other areas of optics : Nanophotonics and photonic crystals

Suppression of Modulation Instability in Broad Area Semiconductor Amplifiers

  • Shubham Kumar, Kestutis Staliunas, Muriel Botey, and Ramon Herrero
  • received 07/15/2014; accepted 08/21/2014; posted 08/22/2014; Doc. ID 217071
  • [full text: PDF (1021) KB)]
  • Abstract: We show that a 2-dimensional periodic modulation of the pump profile (modulation both along- and perpendicularly to the optical axis) can suppress the modulation instability in broad emission area semiconductor amplifiers. In case of a realistic finite-width amplifier the modulation instability can be completely eliminated.

Keywords (OCIS):

  • (160.4330) Materials : Nonlinear optical materials
  • (190.3100) Nonlinear optics : Instabilities and chaos
  • (250.5980) Optoelectronics : Semiconductor optical amplifiers
  • (140.3425) Lasers and laser optics : Laser stabilization

Spectral optimization of color temperature tunable white LEDs with excellent color rendering and luminous efficacy

  • Guoxing He and Ju Tang
  • received 07/02/2014; accepted 08/21/2014; posted 08/22/2014; Doc. ID 215044
  • [full text: PDF (378) KB)]
  • Abstract: The optimization model of limited luminous efficacy (LLE) for correlated color temperature (CCT) tunable phosphor-coated white light-emitting diode (pc-W LED) consisting of blue chips, green and yellow phosphors, and red chips, including down-conversion energy loss, has been developed under constraint of designated color rendering index (CRI) and a special CRI of R9 for strong red. The optimal spectra of pc-W LEDs are obtained with a nonlinear program for maximizing LLE under conditions of both CRI and R9 above 90, 95 and 98 at CCTs of 2700 K to 6500 K. The pc-W LEDs with LLE > 301 lm/W for both CRI and R9 above 90, LLE >290 lm/W for both CRI and R9 above 95, and LLE > 276 lm/W for both CRI and R9 above 98 could be achieved at CCTs of 2700 K to 6500 K. The recommended peak wavelengths and full widths at half maximum for the current LEDs and phosphors, and their photometric and colorimetric performances are presented.

Keywords (OCIS):

  • (220.0220) Optical design and fabrication : Optical design and fabrication
  • (230.3670) Optical devices : Light-emitting diodes
  • (330.1715) Vision, color, and visual optics : Color, rendering and metamerism

Wide-field time-correlated single photon counting (TCSPC) lifetime microscopy at 1 MHz frame rate

  • Klaus Suhling, Frederic Festy, and Liisa Hirvonen
  • received 06/23/2014; accepted 08/21/2014; posted 08/22/2014; Doc. ID 214498
  • [full text: PDF (2549) KB)]
  • Abstract: A 1 MHz frame rate CMOS camera was used in combination with an image intensifier for wide-field time-correlated single photon counting (TCSPC) imaging. The system combines an ultra-fast frame rate with single photon sensitivity and was employed on a fluorescence microscope to image decays of Ruthenium compound Ru(dpp) with lifetimes from ~1 to 5 μs. Compatibility of this method with live-cell imaging was demonstrated by imaging Europium-containing beads with a lifetime of 570 μs in living HeLa cells. A standard two-photon excitation scanning FLIM system was used to independently verify the lifetime for the Europium beads. This approach brings together advantageous features for time-resolved live cell imaging such as low excitation intensity, single photon sensitivity, ultra-fast camera frame rates and short acquisition times.

Keywords (OCIS):

  • (030.5260) Coherence and statistical optics : Photon counting
  • (040.3780) Detectors : Low light level
  • (170.3650) Medical optics and biotechnology : Lifetime-based sensing
  • (170.6920) Medical optics and biotechnology : Time-resolved imaging
  • (180.0180) Microscopy : Microscopy
  • (180.2520) Microscopy : Fluorescence microscopy

Extraction of optical constants using multiple reflections in the terahertz emitter-sample hybrid structure

  • Jongseok Lee, Jeongwoo Han, NanEi Yu, Do Kyeong Ko, Sunyoung Hamh, Taehun Kim, and Kyu-Sup Lee
  • received 07/11/2014; accepted 08/20/2014; posted 08/22/2014; Doc. ID 214910
  • [full text: PDF (1370) KB)]
  • Abstract: To extract optical constants of non-transmitted samples in the terahertz (THz) spectral region, we employ a THz emitter-sample hybrid structure where THz pulses are generated at the emitter surface and multiply reflected at the interface between the THz emitter and the sample. Since each THz electric field profile appears well separated in a time domain, we obtained the amplitude and phase spectra for each pulse from the Fourier transform, and could determine the optical constants of the sample numerically based on the Fresnel equations. We applied this technique for doped semiconductors and a noble metal, and found that obtained optical constants are in good agreement with literature values and also with the values determined by using other conventional THz techniques.

Keywords (OCIS):

  • (300.0300) Spectroscopy : Spectroscopy
  • (300.6495) Spectroscopy : Spectroscopy, teraherz

Families of stationary modes in complex potentials

  • Dmitry Zezyulin and Vladimir Konotop
  • received 08/11/2014; accepted 08/20/2014; posted 08/22/2014; Doc. ID 220734
  • [full text: PDF (302) KB)]
  • Abstract: It is shown that a general class of complex asymmetric potentials of the form $w^2(x)-iw_x(x)$, where $w(x)$ is a real function, allows for the existence of one-parametric continuous families of the stationary nonlinear modes bifurcating from the linear spectrum and propagating in Kerr media. As an example, we introduce an asymmetric double-hump complex potential and show that it supports continuous families of stable nonlinear modes.

Keywords (OCIS):

  • (190.0190) Nonlinear optics : Nonlinear optics
  • (190.5330) Nonlinear optics : Photorefractive optics
  • (190.6135) Nonlinear optics : Spatial solitons

Long distance measurement-device-independent quantum key distribution with coherent-state superpositions

  • Hua Yin, Tengyun Chen, Zeng-Bing Chen, Yang Liu, Yan-Lin Tang, and We-Fei Cao
  • received 05/14/2014; accepted 08/19/2014; posted 08/20/2014; Doc. ID 212004
  • [full text: PDF (860) KB)]
  • Abstract: Measurement-device-independent quantum key distribution (MDI-QKD) is immune to all hacking strategies on the detection side. The decoy-state method is required in the protocol to protect the source from the photon- number-splitting attack. The performance of MDI-QKD with the weak coherent states (WCS) is well studied in recent works. Here in this letter, we propose to use coherent-state superpositions (CSS) in the source. Both the security transmission distance and secure key rate are improved compared with the original protocol. We use an analytical method to estimate the lower bound of yield and the upper bound of error rate, which gives two tight formulas. In our simulation, we find that the secure key rate is increased by more than one order of magnitude compared with the WCS. The protocol also shows a maximum secure distance of more than 375 km in the finite-key case with practical parameters, which is increased by more than 150 km compared with the original protocol.

Keywords (OCIS):

  • (270.5565) Quantum optics : Quantum communications
  • (270.5568) Quantum optics : Quantum cryptography
  • (270.5585) Quantum optics : Quantum information and processing

Nonlinear dynamics of Airy-Vortex 3D wave packets: Emission of vortex light waves.

  • Rodislav Driben and Torsten Meier
  • received 06/17/2014; accepted 08/19/2014; posted 08/20/2014; Doc. ID 212796
  • [full text: PDF (691) KB)]
  • Abstract: The dynamics of 3D Airy-vortex wave packets is studied under the action of strong Kerr nonlinearity. Shedding of nonlinear 3D waves out of the main wave packet with the topological charge of the emitted waves being equal to those carried by the parental light structure is demonstrated. The rapid collapse imposes a severe limitation on the propagation of multidimensional waves in Kerr media. However, the structure of the Airy beam carrier allows the coupling of light from the leading, most intense peak into neighboring peaks and consequently strongly postpones the collapse. The dependence of the critical input amplitude for the appearance of a fast collapse on the beam width is studied for wave packets with zero and non-zero topological charges. Wave packets carrying angular momentum are found to be much more resistant to the rapid collapse, especially those having small width.

Keywords (OCIS):

  • (190.3270) Nonlinear optics : Kerr effect
  • (190.5940) Nonlinear optics : Self-action effects
  • (050.4865) Diffraction and gratings : Optical vortices

Observation of dispersive wave emission by temporal cavity solitons

  • Jae Jang, Stephane Coen, Miro Erkintalo, and Stuart Murdoch
  • received 06/09/2014; accepted 08/18/2014; posted 08/20/2014; Doc. ID 213753
  • [full text: PDF (283) KB)]
  • Abstract: We examine a coherently-driven, dispersion-managed, passive Kerr fiber ring resonator and report the first direct experimental observation of dispersive wave emission by temporal cavity solitons. Our observations are in excellent agreement with analytical predictions and they are fully corroborated by numerical simulations. These results lead to a better understanding of the behavior of temporal cavity solitons under conditions where higher-order dispersion plays a significant role. Significantly, since temporal cavity solitons manifest themselves in monolithic microresonators, our results are likely to explain the origins of spectral features observed in broadband Kerr frequency combs.

Keywords (OCIS):

  • (140.4780) Lasers and laser optics : Optical resonators
  • (190.4370) Nonlinear optics : Nonlinear optics, fibers
  • (190.5530) Nonlinear optics : Pulse propagation and temporal solitons

High-sensitivity strain sensor based on inflated long period fiber grating

  • Yiping Wang, Xiaoyong Zhong, Junle Qu, Changrui Liao, Shen Liu, Jian Tang, Qiao Wang, Jing Zhao, Kaiming Yang, and Zhengyong Li
  • received 07/11/2014; accepted 08/18/2014; posted 08/19/2014; Doc. ID 216723
  • [full text: PDF (1117) KB)]
  • Abstract: We demonstrated a high-sensitivity strain sensor based on an inflated long period fiber grating (I-LPFG). The I-LPFG was inscribed, for the first time, by use of the pressure-assisted CO2 laser beam scanning technique to inflate periodically air holes of a photonic crystal fiber (PCF). Such periodic inflations enhanced the sensitivity of the LPFG-based strain sensor to -5.62 pm/μԑ. After high temperature annealing the I-LPFG, moreover, a good repeatability and stability of temperature response with a sensitivity of 11.92 pm/ ˚C was achieved.

Keywords (OCIS):

  • (050.2770) Diffraction and gratings : Gratings
  • (060.2340) Fiber optics and optical communications : Fiber optics components
  • (060.2370) Fiber optics and optical communications : Fiber optics sensors
  • (060.5295) Fiber optics and optical communications : Photonic crystal fibers

Diffraction of orbital angular momentum carrying optical beams by a circular aperture

  • Surendra Singh, Anindya Ambuj, and Reeta Vyas
  • received 05/08/2014; accepted 08/18/2014; posted 08/20/2014; Doc. ID 211639
  • [full text: PDF (1567) KB)]
  • Abstract: Far field diffraction of Laguerre-Gauss vortex (LGV) beams of different angular momentum index by a circular aperture placed at different locations with respect to incident beam waist is studied experimentally. The experiments reveal a surprisingly simple structure for the diffraction pattern and its dependence on the orbital angular momentum index of the incident beam when the aperture is small compared to the beam radius.

Keywords (OCIS):

  • (260.0260) Physical optics : Physical optics
  • (260.1960) Physical optics : Diffraction theory
  • (140.3295) Lasers and laser optics : Laser beam characterization

A rapid method for fabricating polymeric biconvex parabolic lenslets

  • Lei Li, Rongrong Sun, and Yang Li
  • received 05/27/2014; accepted 08/18/2014; posted 08/19/2014; Doc. ID 212888
  • [full text: PDF (1941) KB)]
  • Abstract: Micro lenslets as well as micro lens arrays have shown tremendous attractions and successes in miniature optical systems in recent decades. However, the fabrication methods for micro lenslets and micro lenslet arrays are limited. In this letter, a rapid and low-cost method for fabricating polymeric biconvex lenslets is presented. This newly developed process is simply based on wetting behavior at interface and is able to produce high quality biconvex lenslets with controllable size and shape. This technology will greatly simplify the production processes and reduce the manufacturing costs for micro optics.

Keywords (OCIS):

  • (220.0220) Optical design and fabrication : Optical design and fabrication
  • (220.3630) Optical design and fabrication : Lenses
  • (220.4000) Optical design and fabrication : Microstructure fabrication
  • (220.4610) Optical design and fabrication : Optical fabrication

Slow light microfluidics: a proposal

  • Misha Sumetsky
  • received 06/13/2014; accepted 08/18/2014; posted 08/19/2014; Doc. ID 214088
  • [full text: PDF (752) KB)]
  • Abstract: The resonant slow light structures created along a thin-walled optical capillary by nanoscale deformation of its surface can perform comprehensive simultaneous detection and manipulation of microfluidic components. This concept is illustrated with a model of a 0.5 millimeter long 5 nm high triangular bottle resonator created at a 50 micron radius silica capillary containing floating microparticles. The developed theory shows that the microparticle positions can be determined from the bottle resonator spectrum. In addition, the microparticles can be driven and simultaneously positioned at predetermined locations by the localized electromagnetic field created by the optimized superposition of eigenstates of this resonator, thus, exhibiting a multicomponent near field optical tweezers.

Keywords (OCIS):

  • (060.2340) Fiber optics and optical communications : Fiber optics components
  • (140.3945) Lasers and laser optics : Microcavities
  • (280.4788) Remote sensing and sensors : Optical sensing and sensors
  • (130.3990) Integrated optics : Micro-optical devices

Optical micro-cavity scanning 3D tomography

  • Andrea Di Donato, Luigino Criante, Sara LoTurco, and Marco Farina
  • received 06/19/2014; accepted 08/18/2014; posted 08/19/2014; Doc. ID 214303
  • [full text: PDF (1984) KB)]
  • Abstract: A scanning optical micro-cavity is exploited to achieve lens-free 3D tomography of microfluidic channels. The micro-cavity, powered by a low-coherence source, is realized by approaching a cleaved fiber to few tens of microns over the sample. The interference of scattered waves inside the cavity shapes the transverse field distribution, by focusing the beam and overcoming the diffraction limit due to the optical fiber numerical aperture. The focusing effect is preserved also in the inner layers of the sample allowing optical 3D tomography. Analysis of microfluidic channels was demonstrated thought this non-invasive technique. Although the experimental set-up recalls the well-known fiber-optic Fourier-domain common path optical coherence tomography, the proposed method has intrinsic characteristics that distinguish it from the former one

Keywords (OCIS):

  • (060.2310) Fiber optics and optical communications : Fiber optics
  • (110.4500) Imaging systems : Optical coherence tomography
  • (140.3948) Lasers and laser optics : Microcavity devices
  • (130.3990) Integrated optics : Micro-optical devices

In vivo analysis of burns in a mouse model using spectroscopic optical coherence tomography

  • Adam Wax, Volker Jaedicke, Jason Maher, manuel medina, Howard Levinson, Maria Selim, and William Brown
  • received 06/25/2014; accepted 08/18/2014; posted 08/22/2014; Doc. ID 214719
  • [full text: PDF (1219) KB)]
  • Abstract: Spectroscopic analysis of biological tissues can provide insight into changes in structure and function due to disease or injury. Depth resolved spectroscopic measurements can be implemented for tissue imaging using optical coherence tomography (OCT). Here spectroscopic OCT is applied to in vivo measurement of burn injury in a mouse model. Data processing and analysis methods are compared for their accuracy. Overall accuracy in classifying burned tissue was found to be as high as 91%, producing an area under the curve of a receiver operator characteristic curve of 0.97. The origins of the spectral changes are identified by correlation with histopathology.

Keywords (OCIS):

  • (110.4500) Imaging systems : Optical coherence tomography
  • (170.6510) Medical optics and biotechnology : Spectroscopy, tissue diagnostics

Articles 1 to 20 of 115 Next Page >>





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