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Articles 1 to 20 of 109 Next Page >>


Sensitivity of coherent anti-Stokes Raman lineshape to time asymmetry of laser pulses

  • Michele Marrocco, Per-Erik Bengtsson, and Emil Nordström
  • received 07/07/2014; accepted 08/28/2014; posted 08/29/2014; Doc. ID 216539
  • [full text: PDF (573) KB)]
  • Abstract: We show that coherent anti-Stokes Raman lineshapes do not follow known spectral profiles if the time asymmetry of realistic laser pulses is taken into account. Examples are given for nanosecond and picosecond laser pulses commonly employed in frequency-resolved coherent anti-Stokes Raman scattering. More remarkably, the analysis suggests an effect of line narrowing in comparison to the customary approach, based primarily on the Voigt lineshape.

Keywords (OCIS):

  • (190.1900) Nonlinear optics : Diagnostic applications of nonlinear optics
  • (190.4380) Nonlinear optics : Nonlinear optics, four-wave mixing
  • (190.5650) Nonlinear optics : Raman effect
  • (300.3700) Spectroscopy : Linewidth
  • (300.6230) Spectroscopy : Spectroscopy, coherent anti-Stokes Raman scattering
  • (300.6290) Spectroscopy : Spectroscopy, four-wave mixing

Experimental Observation of Giant Goos-Hänchen Shift in Graphene Using a Beam Splitter Scanning Method

  • Zhi-Bo Liu, Xin Li, Peng Wang, Fei Xing, Xu-Dong Chen, and Jian-Guo Tian
  • received 07/17/2014; accepted 08/28/2014; posted 08/29/2014; Doc. ID 217179
  • [full text: PDF (803) KB)]
  • Abstract: Giant Goos-Hänchen (G-H) shift in graphene has been theoretically predicted by previous research.expected. In this letter, we present experimental measurements of the G-H shift in graphene, in a total internal reflection condition, using a new process we have named “the beam splitter scanning method.” Our results show that a focused light source undergoes significant lateral movement when the polarization of incident light changes from transverse magnetic (TM) to transverse electric (TE) mode, indicating a large G-H shift in graphene that is polarization-dependent. We also observed that the difference in the G-H shift for TM versus TE modes (STM-STE) increases with increasing thickness of graphene material. A maximum difference (STM-STE) of 31.16 μm was observed, which is a significant result. Based on this research, the ability to engineer giant G-H shifts in graphene material exists and has now been experimentally confirmed for the first time. We expect that this result lead to significant new and interesting applications of graphene in various types of optical sensors, and more.

Keywords (OCIS):

  • (260.6970) Physical optics : Total internal reflection
  • (160.4236) Materials : Nanomaterials

Pump enhanced monochromatic terahertz-wave parametric oscillator toward multi-MW level peak power

  • Kyosuke Saito, Yutaka Oyama, and Tadao Tanabe
  • received 08/07/2014; accepted 08/28/2014; posted 08/29/2014; Doc. ID 217225
  • [full text: PDF (629) KB)]
  • Abstract: Pump enhanced optical parametric oscillation under cavity phase matching (CPM) configuration is an effective way to obtain a monochromatic terahertz (THz) waves with high pulse energy. Numerical simulations are conducted for THz wave generations using a GaP sheet cavity. By optimizing the optical pulse duration and cavity configuration, estimated peak power of THz waves is 8 MW at 3 THz, which corresponds to the photon conversion efficiency of η ≈ 0.85. Our proposed scheme can generate THz-wave with high pulse energy, which is suitable for the nonlinear optical effects in THz frequency region.

Keywords (OCIS):

  • (190.0190) Nonlinear optics : Nonlinear optics
  • (190.4410) Nonlinear optics : Nonlinear optics, parametric processes

Intense Cr:forsterite-laser-based supercontinuum source

  • Ludovit Haizer, Aleksei Zheltikov, Eleftherios Goulielmakis, Evgenii Serebryannikov, Ignac Bugar, Dusan Lorenc, and Frantisek Uherek
  • received 07/04/2014; accepted 08/28/2014; posted 08/29/2014; Doc. ID 215199
  • [full text: PDF (722) KB)]
  • Abstract: Supercontinuum pulses covering the range from 1100 to 1700 nm with energies >1.0 mJ and excellent beam quality are generated via nonlinear spectral broadening of Cr:forsterite (1240 nm, 110 fs) pulses in pressurized molecular nitrogen. Our spectra, which extend over more than half an octave, offer an attractive alternative for intense few-cycle pulse synthesis in the 1-2-μm range and lend themselves as an important add-on to Cr:forsterite laser technologies.

Keywords (OCIS):

  • (190.7110) Nonlinear optics : Ultrafast nonlinear optics
  • (290.5860) Scattering : Scattering, Raman
  • (320.5520) Ultrafast optics : Pulse compression
  • (320.7120) Ultrafast optics : Ultrafast phenomena
  • (320.6629) Ultrafast optics : Supercontinuum generation

Fabricating nanostructures on fused silica using femtosecond infrared pulses combining with sub-nanojoule ultraviolet pulses

  • Shuting Lei, Xiaoming Yu, Zenghu Chang, and Paul Corkum
  • received 07/29/2014; accepted 08/28/2014; posted 08/29/2014; Doc. ID 219994
  • [full text: PDF (1829) KB)]
  • Abstract: Circular craters with diameters of 500 nm are fabricated on the surface of fused silica by femtosecond ultraviolet-infrared (UV-IR) pulse trains with 0.8 nJ UV pulse energy. UV damage thresholds at different IR energies and UV-IR delays are measured. Diameters and depths of the ablated craters can be modified by adding the IR pulse and varying the UV-IR delays. These results demonstrate the feasibility of nanomachining using short wavelength lasers with pulse energy far below normal damage thresholds.

Keywords (OCIS):

  • (240.4350) Optics at surfaces : Nonlinear optics at surfaces
  • (260.7190) Physical optics : Ultraviolet
  • (320.2250) Ultrafast optics : Femtosecond phenomena
  • (220.4241) Optical design and fabrication : Nanostructure fabrication

On the speckle number of interferometric velocity and distance measurements of moving rough surfaces

  • Robert Kuschmierz, Andreas Fischer, Nektarios Koukourakis, and Juergen Czarske
  • received 07/31/2014; accepted 08/27/2014; posted 08/29/2014; Doc. ID 220148
  • [full text: PDF (571) KB)]
  • Abstract: The minimum achievable systematic uncertainty of interferometric measurements is fundamentally limited due to speckle noise. Numerical and experimental results are presented, which show that the measurement uncertainty for velocity and position depends on the number of speckles on the photo detectors. However, while the systematic uncertainty due to the speckle effect decreases, the random uncertainty due to noise from the photo detector increases with increasing speckle number. This results in a minimal total measurement uncertainty for an optimal speckle number on the photo detector, which is achieved by adjusting the aperture of the detection optics.

Keywords (OCIS):

  • (030.6140) Coherence and statistical optics : Speckle
  • (120.3180) Instrumentation, measurement, and metrology : Interferometry
  • (120.5050) Instrumentation, measurement, and metrology : Phase measurement
  • (120.7250) Instrumentation, measurement, and metrology : Velocimetry
  • (280.3340) Remote sensing and sensors : Laser Doppler velocimetry

Strip-slot waveguide mode converter based on symmetric multimode interference

  • Zhiping Zhou, Qingzhong Deng, Lu Liu, and Xinbai Li
  • received 08/11/2014; accepted 08/27/2014; posted 08/29/2014; Doc. ID 220833
  • [full text: PDF (855) KB)]
  • Abstract: The optical mode mismatch makes coupling between strip and slot waveguides a tough issue in integrated photonics. This paper presents both numerical and experimental results of a strip-slot mode converter based on symmetric multimode interference (MMI). Different from previous reported converters which gradually convert the mode through sharp tips, the proposed solution makes full use of the symmetry of the two-fold image of MMI and its field distribution similarity with slot waveguide to convert the mode. Converter based on this mechanism is able to convert light from TE-polarized fundamental mode of strip waveguide to that of slot waveguide and vice versa. Strip-slot waveguide coupling though this mode converter have a measured efficiency of 97% (-0.13 dB) while the dimension is as small as 1.24 μm × 6 μm. Further analysis shows that the proposed converter is highly tolerant to fabrication imperfections and is wavelength insensitive.

Keywords (OCIS):

  • (130.0130) Integrated optics : Integrated optics
  • (130.2790) Integrated optics : Guided waves
  • (130.3120) Integrated optics : Integrated optics devices

Tunable coupled-mode dispersion compensation and its application to on-chip resonant four-wave mixing

  • Cale Gentry, Milos Popovic, and Xiaoge Zeng
  • received 06/23/2014; accepted 08/26/2014; posted 08/29/2014; Doc. ID 214535
  • [full text: PDF (910) KB)]
  • Abstract: We propose and demonstrate mode coupling as a viable dispersion compensation technique for phase-matched resonant four-wave mixing (FWM). We demonstrate a dual-cavity resonant structure that employs coupling-induced frequency splitting at one of three resonances to compensate for cavity dispersion, enabling phase-matching. Coupling strength is controlled by thermal tuning of one cavity enabling active tuning of the resonant frequency-matching. In a fabricated silicon microresonator, we show an 8 dB enhancement of seeded FWM efficiency over the non-compensated state. The measured four-wave mixing has a peak wavelength conversion efficiency of -37.9 dB across a free spectral range (FSR) of 3.334 THz (~27 nm), which is, to our knowledge, the largest in silicon to demonstrate FWM to date. This form dispersion compensation can be beneficial for many devices including wavelength converters, parametric amplifiers, and widely detuned correlated photon-pair sources. Apart from compensating intrinsic dispersion, the proposed mechanism can alternatively be utilized in an otherwise dispersionless resonator to counteract the detuning effect of self- and cross-phase modulation on the pump resonance during FWM, thereby addressing a fundamental issue in the performance of light sources such as broadband optical frequency combs.

Keywords (OCIS):

  • (190.4380) Nonlinear optics : Nonlinear optics, four-wave mixing
  • (130.2035) Integrated optics : Dispersion compensation devices
  • (130.3990) Integrated optics : Micro-optical devices

Investigation of electric/magnetic local interaction between Si photonic-crystal nanocavities and Au meta-atoms

  • Susumu Noda, Takashi Asano, Yoonsik Yi, Yoshinori Tanaka, and Bong-Shik Song
  • received 07/22/2014; accepted 08/26/2014; posted 08/26/2014; Doc. ID 217518
  • [full text: PDF (1328) KB)]
  • Abstract: We experimentally investigate nano-scale local interaction in a composite system consisting of dielectric photonic-crystal nanocavity and metallic meta-atoms. The Q factor of the composite system changes by a maximum of about 10dB based on the relative position and the type of meta-atoms. The emission by meta-atoms dominates the nanocavity emission when they are in the electric or magnetic anti-nodes of the cavity field. Circularly polarized emission is achieved by tuning the polarization, the position, and the coupling phase of each meta-atom with respect to the nanocavity. Utilization of the local interaction with meta-atoms is shown to be useful as a new degree of freedom in tailoring the characteristics of nanocavities.

Keywords (OCIS):

  • (160.3918) Materials : Metamaterials
  • (230.5298) Optical devices : Photonic crystals
  • (250.5403) Optoelectronics : Plasmonics

Holographic 3D display observable for multiple simultaneous viewers from all horizontal directions by using a time division method

  • Toyohiko Yatagai, Daisuke Barada, and Yusuke Sando
  • received 07/25/2014; accepted 08/25/2014; posted 08/26/2014; Doc. ID 217794
  • [full text: PDF (1395) KB)]
  • Abstract: A holographic three-dimensional (3D) display system with a viewing angle of 360° by using a high-speed digital micromirror device (DMD) has been proposed. The wavefront modulated by the DMD enters a rotating mirror tilted vertically downward. The synchronization of the rotating mirror and holograms displayed on the DMD allows for the reconstruction of a wavefront propagating in all horizontal directions. An optical experiment has been demonstrated in order to verify our proposed system. Binocular vision is realized from anywhere within the horizontal plane. Our display system enables simultaneous observation by multiple viewers at an extremely close range.

Keywords (OCIS):

  • (090.1760) Holography : Computer holography
  • (090.2870) Holography : Holographic display
  • (090.5694) Holography : Real-time holography

Temporal Solitons in ε-Near-Zero Plasmonic Channels

  • Andrea Alu, Christos Argyropoulos, Giuseppe D'Aguanno, and Pai-Yen Chen
  • received 05/19/2014; accepted 08/25/2014; posted 08/26/2014; Doc. ID 212312
  • [full text: PDF (467) KB)]
  • Abstract: The properties of temporal solitons propagating in an array of ε-Near-Zero (ENZ) plasmonic channels loaded with a material possessing a cubic (χ(3)) nonlinearity are theoretically explored. The unique interplay between the peculiar dispersion properties of such ENZ channels and their exceptionally enhanced effective nonlinearity conspire to yield extremely low threshold intensity for the formation of slow group velocity solitons

Keywords (OCIS):

  • (190.0190) Nonlinear optics : Nonlinear optics
  • (190.5530) Nonlinear optics : Pulse propagation and temporal solitons
  • (160.3918) Materials : Metamaterials

Monolithic Integration of Nitride Light Emitting Diodes and Photodetectors for Bi-directional Optical Communication

  • Jian Xu, Mahmoud Atalla, Zhenyu Jiang, Guanjun You, Li Wang, Xiaoyun Li, Jie Liu, Asim Elahhi, and Lai Wei
  • received 06/04/2014; accepted 08/25/2014; posted 08/29/2014; Doc. ID 213343
  • [full text: PDF (509) KB)]
  • Abstract: Design and fabrication of monolithically integrated III-Nitride visible light-emitting-diodes (LEDs) and ultraviolet Schottky barrier-photodetectors (SB-PDs) have been proposed and demonstrated. Responsivity up to 0.2 A/W at 365nm for the GaN SB-PDs has been achieved. It is shown that those UV SB-PDs were capable of sensitive UV light detection down to 7.16×10^-4 W/cm² at 365nm, whereas the on-chip working LEDs have produced negligible crosstalk at the practical illumination brightness. The monolithically integrated LEDs and SB-PDs can function as transmitters to emit visible light signals and as receivers to analyze incoming UV signals, respectively, which offers the potential of using such devices for the bi-directional optical wireless communication application .

Keywords (OCIS):

  • (040.7190) Detectors : Ultraviolet
  • (230.3120) Optical devices : Integrated optics devices
  • (230.3670) Optical devices : Light-emitting diodes
  • (230.5170) Optical devices : Photodiodes
  • (250.0250) Optoelectronics : Optoelectronics
  • (060.2605) Fiber optics and optical communications : Free-space optical communication

Triply-resonant four-wave mixing in silicon coupled resonator micro-ring waveguides

  • Junrong Ong, Shayan Mookherjea, and Ranjeet Kumar
  • received 08/05/2014; accepted 08/25/2014; posted 08/26/2014; Doc. ID 220435
  • [full text: PDF (4608) KB)]
  • Abstract: We report measurements of continuous-wave four-wave mixing (FWM) in which the pump, signal and idler wavelengths are each resonant in an un-apodized coupled resonator optical waveguides (CROW) consisting of 11 coupled racetrack micro-rings. A maximum conversion efficiency of -21.3 dB at 100 mW pump power, and wavelength conversion at 10 Gbps is demonstrated, with open eye diagrams showing feasibility for all-optical signal processing.

Keywords (OCIS):

  • (230.3120) Optical devices : Integrated optics devices
  • (230.4555) Optical devices : Coupled resonators
  • (230.7405) Optical devices : Wavelength conversion devices

Numerical Approach to Statistical Properties of Resonance Fluorescence

  • Jung-Tsung Shen and Matthew Bradford
  • received 07/01/2014; accepted 08/24/2014; posted 08/26/2014; Doc. ID 215027
  • [full text: PDF (441) KB)]
  • Abstract: We formulate a numerical scheme to investigate the correlation of photons scattered by a two-level atom coupled to a waveguide, and compute the second order correlation function. We also show that a three-dimensional resonance fluorescence experiment can be mapped into the one-dimensional situation studied here. The correlation functions for both cases show excellent agreement.

Keywords (OCIS):

  • (270.0270) Quantum optics : Quantum optics
  • (270.4180) Quantum optics : Multiphoton processes
  • (270.5290) Quantum optics : Photon statistics
  • (270.5580) Quantum optics : Quantum electrodynamics

Symmetry breaking of solitons in one-dimensional parity-time-symmetric optical potentials

  • Jianke Yang
  • received 07/30/2014; accepted 08/23/2014; posted 08/26/2014; Doc. ID 219993
  • [full text: PDF (292) KB)]
  • Abstract: Symmetry breaking of solitons in a class of one-dimensional parity-time (\PT) symmetric complex potentials with cubic nonlinearity is reported. In generic \PT-symmetric potentials, such symmetry breaking is forbidden. However, in a special class of \PT-symmetric potentials $V(x)=g^2(x)+\alpha g(x)+ i g'(x)$, where $g(x)$ is a real and even function and $\alpha$ a real constant, symmetry breaking of solitons can occur. That is, a branch of non-\PT-symmetric solitons can bifurcate out from the base branch of \PT-symmetric solitons when the base branch's power reaches a certain threshold. At the bifurcation point, the base branch changes stability, and the bifurcated branch can be stable.

Keywords (OCIS):

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

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

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

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

Articles 1 to 20 of 109 Next Page >>

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