OSA's Digital Library

Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  •  

Optics InfoBase > JOSA B > Early Posting

Early Posting

Accepted papers to appear in an upcoming issue

OSA now posts prepublication articles as soon as they are accepted and cleared for production. See the FAQ for additional information.

Articles 1 to 20 of 45 Next Page >>

February


Third order nonlinear optical properties exhibited by a bilayer configuration of silver nanoparticles integrated to silicon nanocrystals embedded in ion-implanted silica

  • Carlos Torres-Torres, Alejandra López-Suárez, Bonifacio Can-Uc, Raul Rangel-Rojo, Carlos Valencia, and Alicia Oliver
  • received 11/11/2014; accepted 02/28/2015; posted 03/03/2015; Doc. ID 226749
  • [full text: PDF (632) KB)]
  • Abstract: We present optical Kerr effect, and nonlinear optical absorption studies of two closely spaced distributions of silver nanoparticles embedded in silica containing ion-implanted silicon nanocrystals. The z-scan technique was used to explore the third-order optical nonlinear response at 830 nm with 80 fs pulses. Two-wave mixing experiments were comparatively examined by a vectorial method at 532 nm wavelength using nanosecond pulses. The femtosecond results reveal that both saturated, and two-photon absorption seem to contribute to the nonlinear absorption observed. From nanosecond observations we identify that a remarkable enhancement in the third order optical nonlinearity is achieved by the double-implantation process.

Keywords (OCIS):

  • (160.4330) Materials : Nonlinear optical materials
  • (190.0190) Nonlinear optics : Nonlinear optics
  • (190.3270) Nonlinear optics : Kerr effect
  • (190.4400) Nonlinear optics : Nonlinear optics, materials
  • (160.4236) Materials : Nanomaterials

High average power, diffraction-limited picosecond output from a sapphire face-cooled Nd:YVO₄ slab amplifier

  • Takashige Omatsu, Masashi Abe, Hiroki Seki, Maya Kowa, Yuta Sasaki, and Katsuhiko Miyamoto
  • received 02/04/2015; accepted 02/27/2015; posted 02/27/2015; Doc. ID 233911
  • [full text: PDF (916) KB)]
  • Abstract: We demonstrated high average power, diffraction-limited (M²~1.1) pico-second output from a sapphire face-cooled Nd:YVO₄ slab amplifier at 1064nm in a multi-pass geometry. Average output power of 44.5 W was achieved at an optical efficiency of 56%. Second harmonic power of 24.1 W was also obtained at an input fundamental power of 36 W, corresponding to a conversion efficiency of 67%.

Keywords (OCIS):

  • (140.3280) Lasers and laser optics : Laser amplifiers
  • (140.3580) Lasers and laser optics : Lasers, solid-state
  • (320.5390) Ultrafast optics : Picosecond phenomena

Optimization of pulse compression in fiber CPA system by adjusting dispersion parameters of temperature-tuned CFBG stretcher

  • Julijanas Zeludevicius, Kestutis Regelskis, and Rokas Danilevicius
  • received 01/13/2015; accepted 02/25/2015; posted 02/26/2015; Doc. ID 232356
  • [full text: PDF (875) KB)]
  • Abstract: In this work we present a femtosecond fiber CPA (FCPA) system with a temperature tuned CFBG stretcher for uncompensated higher-order spectral phase reduction. An improvement in pulse compression through the optimization of nonlinear temperature distribution along CFBG stretcher is predicted numerically and verified experimentally by using CFBG stretcher with 4 independent thermoelectric cooler (TEC) elements.

Keywords (OCIS):

  • (060.2320) Fiber optics and optical communications : Fiber optics amplifiers and oscillators
  • (320.7090) Ultrafast optics : Ultrafast lasers
  • (230.2035) Optical devices : Dispersion compensation devices
  • (060.3735) Fiber optics and optical communications : Fiber Bragg gratings

Improving the sensitivity of optically pumped magnetometers by hyperfine repumping

  • Volkmar Schultze, Theo Scholtes, Rob IJsselsteijn, and Hans-Georg Meyer
  • received 12/04/2014; accepted 02/24/2015; posted 02/25/2015; Doc. ID 229148
  • [full text: PDF (1989) KB)]
  • Abstract: Most optically pumped magnetometers based on alkali atom vapor cells and pumped by a single narrow-band laser suffer from a loss of signal since atoms become trapped in the ground state hyperfine states that are not coupled to the laser beam. This can be counteracted by additional optical repumping these ground state levels. We study hyperfine repumping using cesium vapor cells with partly overlapped ground state splitting due to their nitrogen buffer gas filling. We implement two ways of repumping and compare them to the conventional case of F=4 pumping: F=3 repumping with an additional repumper laser and combined pumping/repumping in the light-narrowing mode, where a single high-power laser is tuned near to the F=3 transitions. The three modes each are investigated for two different ways of spin-phase synchronization; the Mx and intensity modulation method. For both methods, any kind of repumping results in a clear improvement of the magnetometer sensitivity compared to operation without it, but in the Mx mode it is more pronounced (about 50 vs. 200 fT/√Hz for a 50 mm3 Cs vapor cell). The mechanisms responsible for the distinct results in the different working modes are discussed.

Keywords (OCIS):

  • (020.2930) Atomic and molecular physics : Hyperfine structure
  • (020.7490) Atomic and molecular physics : Zeeman effect
  • (040.1880) Detectors : Detection
  • (140.5560) Lasers and laser optics : Pumping

Effects of Deep-Subwavelength Surface Roughness on Fields of Plasmonic Thin Film Based on Lippmann-Schwinger Equation in the Spectral Domain

  • Leung Tsang, Nicholaos Limberopoulos, Kung-Hau Ding, Xudong Li, Philippe Duvelle, Jarrett Vella, Christie Devlin, and John Goldsmith
  • received 09/17/2014; accepted 02/23/2015; posted 02/24/2015; Doc. ID 222770
  • [full text: PDF (1691) KB)]
  • Abstract: In this paper, we consider a line source over a plasmonic thin film with surface roughness. Using layered medium Green’s functions, we derive the Lippmann-Schwinger equation in the spectral domain with scattering potentials. Because of deep-subwavelength surface roughness, the scattering potentials are next approximated by the small height approximation so that the solutions of fields in the spectral domain can be computed readily. Numerical results are illustrated for the surface fields on the rough surface and the fields in the image plane. For periodic roughness, small periods, on the order of 0.1λ, and small heights, on the order of 0.01λ, are used. For the case of random roughness, we choose the correlation length to be much smaller than a wavelength, on the order of 0.1λ, and height on the order of 0.01λ. The results of the fields on the rough surface in the spectral domain show that subwavelength roughness creates fields with wave vector components that are many times larger than the free space wavenumber ( 10k or larger ). In the spatial domain, the imaging is enhanced by the deep-subwavelength roughness. Results of the small roughness approximation are in good agreement with that of exact potential and that of the method of moments (MoM).

Keywords (OCIS):

  • (220.3630) Optical design and fabrication : Lenses
  • (240.0240) Optics at surfaces : Optics at surfaces
  • (240.0310) Optics at surfaces : Thin films
  • (240.5770) Optics at surfaces : Roughness
  • (240.6680) Optics at surfaces : Surface plasmons
  • (250.5403) Optoelectronics : Plasmonics

Optical nanoantenna based on asymmetric nanohole pair milled in an opaque gold film

  • Mohsen Janipour and Mohammad Azim Karami
  • received 01/19/2015; accepted 02/23/2015; posted 02/23/2015; Doc. ID 232591
  • [full text: PDF (1397) KB)]
  • Abstract: The optical interaction of two asymmetric nanoholes milled in an opaque gold film through surface plasmon polariton (SPP) propagation is investigated. It is shown that the interaction between the nanoholes, strongly depends on the polarization direction of the incident light. Moreover, it is found that the asymmetric nanohole pair can direct the incident light. The directivity of the nanohole pair depends on the separation distance between the nanoholes, which leads to in-phase and anti-phase interaction of the nanoholes. For short distances, (comparable to the SPP wavelength launched by each nanohole) the interaction can be considerable, in contrast to the high separation distance, which leads to weaker interaction between the nanoholes. The interaction mechanism of the nanoholes has been supported by magnetic-coupled dipole approximation method.

Keywords (OCIS):

  • (050.1220) Diffraction and gratings : Apertures
  • (250.5403) Optoelectronics : Plasmonics
  • (310.6628) Thin films : Subwavelength structures, nanostructures

Quantum dot based single photon avalanche detector for mid infrared applications

  • Mahdi Zavvari
  • received 06/12/2014; accepted 02/23/2015; posted 02/23/2015; Doc. ID 213956
  • [full text: PDF (415) KB)]
  • Abstract: A single photon detector is presented with quantum dot layers in its absorption region. The proposed detector is a three-terminal device in which a quantum dot infrared photodetector (QDIP) is integrated with an avalanche multiplication region through a tunneling barrier and the applied bias of each region can be controlled separately. The mid-infrared single photons (λ=3~5μm) can be absorbed in QDIP and drifted to avalanche region to trigger an avalanche and generate an output pulse. Since the absorption region consists of doped quantum dot layers, it is expected to have higher orders of dark count. However by separate controlling the bias and keeping the electric field of absorption region low, the dark current of this region can be reduced. Our simulations predict a single photon detection efficiency (SPQE) about 0.7 at T=50K for proposed detector. For higher temperatures dark count rate increases and results in reduced SPQE. To improve the operation temperature, resonant tunneling barriers (RTB) are included in absorption region to inhibit the thermally excited electrons from contribution in dark current generation. Our results show that the SPQE for RTB based device is about 0.65 at T=77K which is approximately equivalent to the SPQE of the device without RTB at T=50K.

Keywords (OCIS):

  • (040.3060) Detectors : Infrared
  • (040.5160) Detectors : Photodetectors
  • (040.5570) Detectors : Quantum detectors
  • (230.5590) Optical devices : Quantum-well, -wire and -dot devices
  • (040.1345) Detectors : Avalanche photodiodes (APDs)

Gap solitons attached to a gapless layer

  • Thawatchai Mayteevarunyoo and Boris Malomed
  • received 01/28/2015; accepted 02/22/2015; posted 02/23/2015; Doc. ID 233495
  • [full text: PDF (1091) KB)]
  • Abstract: We consider linear and nonlinear modes pinned to a grating-free layer placed between two symmetric or asymmetric semi-infinite Bragg gratings (BGs), with a possible phase shift between them, in a medium with the uniform Kerr nonlinearity. The asymmetry is defined by a difference between widths of the bandgap in the two BGs. In the linear system, exact defect modes (DMs) are found. Composite pinned gap solitons are found, analytically and numerically, in the full nonlinear model. In the asymmetric system, existence boundaries for the DMs and gap solitons, due to the competition between attraction to the gapless layer and repulsion from the reflectivity step, are obtained in an analytical form. Stability boundaries for solitons in the asymmetric system are identified by means of direct simulations. Collisions of moving BG solitons with the gapless layer are studied too.

Keywords (OCIS):

  • (190.5530) Nonlinear optics : Pulse propagation and temporal solitons
  • (060.3735) Fiber optics and optical communications : Fiber Bragg gratings
  • (160.5293) Materials : Photonic bandgap materials

PROBABILITY DENSITY FUNCTION OF THE RATE OF ENERGY TRANSFER FROM LUMINESCENT IONS TO A RANDOM DISTRIBUTION OF TRAPS IN THE STATIC LIMIT

  • Jean-Francois Bisson
  • received 12/08/2014; accepted 02/22/2015; posted 02/23/2015; Doc. ID 229080
  • [full text: PDF (745) KB)]
  • Abstract: The transfer of excitation of luminescent ions to a random distribution of traps is revisited in the static limit, with the emphasis on the probability density function (pdf) of the decay rate. Knowledge of the pdf is advantageous for situations where the time evolution of an individual ion’s excited state differs from an exponential decay or when no closed-form solution for the ensemble average exists, because it allows one to reconstruct an ensemble average from the knowledge of the behavior of a single class of ions. A model with dipole-dipole interactions with no minimum distance leads, in the continuum limit, to an inverse gamma (IG) probability distribution with shape parameter α=1/2 which has infinite moments. With a minimum nearest trap distance, close-form solutions of the moments of the actual pdf are well matched with those of a smoothly truncated IG distribution. Experimental luminescence decay obtained on Yb3+-doped Y2O3 thin films displaying non exponential decay behavior agrees well with the proposed model.

Keywords (OCIS):

  • (000.5490) General : Probability theory, stochastic processes, and statistics
  • (140.3380) Lasers and laser optics : Laser materials
  • (140.5680) Lasers and laser optics : Rare earth and transition metal solid-state lasers
  • (160.3380) Materials : Laser materials
  • (160.5690) Materials : Rare-earth-doped materials
  • (140.3615) Lasers and laser optics : Lasers, ytterbium

Tackling the Limits of Optical Fiber Links

  • Paul-Eric Pottie, Fabio Stefani, Olivier Lopez, Anthony Bercy, Won-Kyu Lee, Christian Chardonnet, GIORGIO SANTARELLI, and Anne Amy-Klein
  • received 12/04/2014; accepted 02/21/2015; posted 02/23/2015; Doc. ID 228924
  • [full text: PDF (1534) KB)]
  • Abstract: We theoretically and experimentally investigate relevant noise processes arising in optical fiber links, which fundamentally limit their relative stability. We derive the unsuppressed delay noise for three configurations of optical links : two-way method, Sagnac interferometry, and actively compensated link, respectively designed for frequency comparison, rotation sensing, and frequency transfer. We also consider an alternative two-way setup allowing real-time frequency comparison and demonstrate its effectiveness on a proof-of-principle experiment with a 25-km fiber spool. For these three configurations, we analyze the noise arising from uncommon fiber paths in the interferometric ensemble and design optimized interferometers. We demonstrate interferometers with very low temperature sensitivity of respectively -2.2, -0.03 and 1 fs/K. We use one of these optimized interferometers on a long haul compensated fiber link of 540 km. We obtain a relative frequency stability of 3 1E-20 after 10000 s of integration time.

Keywords (OCIS):

  • (060.2360) Fiber optics and optical communications : Fiber optics links and subsystems
  • (120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
  • (120.5050) Instrumentation, measurement, and metrology : Phase measurement
  • (120.5790) Instrumentation, measurement, and metrology : Sagnac effect
  • (350.4600) Other areas of optics : Optical engineering

Hartman effect in a doped one dimensional photonic crystal at normal and oblique incidences

  • Mostafa Sahrai, Hamed Sattari, Jafar Poursamad Bonab, and Roghayeh Aghaei
  • received 12/10/2014; accepted 02/20/2015; posted 02/23/2015; Doc. ID 228987
  • [full text: PDF (4002) KB)]
  • Abstract: Hartman effect in one dimensional photonic crystal containing a defect layer doped by three level ladder type atoms is theoretically investigated for normal and oblique incidences. Influence of the relative phase of applied fields and the intensity of coupling field on Hartman effect is then discussed. We find that Hartman effect can be switched from positive to negative (or vic versa) just by adjusting the relative phase of applied fields, the intensity of coupling field and the proper choice of incident angle.

Keywords (OCIS):

  • (160.4760) Materials : Optical properties
  • (240.7040) Optics at surfaces : Tunneling
  • (270.1670) Quantum optics : Coherent optical effects
  • (160.5298) Materials : Photonic crystals

Hysteresis assisted narrowband resonances in a chain of nonlinear plasmonic arrays

  • Arkadi Chipouline, Nikolay Rosanov, Sergey Fedorov, and Thomas Pertsch
  • received 09/19/2014; accepted 02/20/2015; posted 02/23/2015; Doc. ID 223397
  • [full text: PDF (1178) KB)]
  • Abstract: The plasmonic structures exhibiting narrowband resonances (NBR) are of a great interest for various applications. We propose to use hysteresis behavior in a 1D system of nonlinear nanoresonators in order to achieve the NRB; the nonlinearity is provided by saturation of a two-level quantum system coupled with the nanoresonators (nanolaser/spaser configuration). Quantum Dots (QD) were assumed as quantum systems; their numerical parameters have been adopted for estimations. Role of the loss compensation on the quality of the NBR is shown for below (under compensation) and above threshold (generating spasers) operation modes. Amplitude and phase detection schemes of the prospective experimental realization are compared using the developed model. Possible sensor oriented applications of the proposed system are discussed.

Keywords (OCIS):

  • (140.3290) Lasers and laser optics : Laser arrays
  • (190.0190) Nonlinear optics : Nonlinear optics
  • (190.1450) Nonlinear optics : Bistability

Terahertz-wave detection in a GaP based hybrid waveguide using a nonlinear optical parametric process

  • Kyosuke Saito, Tadao Tanabe, and Yutaka Oyama
  • received 10/30/2014; accepted 02/20/2015; posted 02/23/2015; Doc. ID 226042
  • [full text: PDF (550) KB)]
  • Abstract: We design and simulate a GaP based hybrid waveguide structure for room temperature THz wave detection by using nonlinear optical parametric process which is based on the photonic conversion from THz to optical domain. The waveguide structure consists of a GaP rib waveguide for optical pump light and Si waveguide for THz wave can provide the conversion from THz to optical frequency domain. Owing to the strong confinement of THz wave into the waveguide, high conversion efficiency of 0.05 W-1 (detection at 4.7 THz) can be achieved. The noise equivalent power for the THz wave detection by using an optical single photon detector is estimated to be 12 fW/Hz1/2, which is higher than that obtained by using a commercially available 4.2 K Si bolometer.

Keywords (OCIS):

  • (000.4430) General : Numerical approximation and analysis
  • (190.4223) Nonlinear optics : Nonlinear wave mixing
  • (190.4975) Nonlinear optics : Parametric processes
  • (130.7405) Integrated optics : Wavelength conversion devices

Broadband infrared continuum generation in dispersion shifted tapered fiber

  • Dmitry Korobko, Oleg Okhotnikov, Alexej Sysoliatin, Igor Zolotovskii, and Dmitry Stoliarov
  • received 11/25/2014; accepted 02/20/2015; posted 02/20/2015; Doc. ID 228513
  • [full text: PDF (3475) KB)]
  • Abstract: Experimental and theoretical studies of supercontinuum generation in the telecom spectral window are reported for fibers with shifted decreasing anomalous dispersion. Numerical analysis highlights the high average power of the emitted dispersive waves and the good spectral flatness achieved within the control spectral band for the supercontinuum generated in optical fiber tapers. Reduction of the third order dispersion in optical fiber tapers is shown to cause spectral broadening which is extended by hundreds of nanometers in comparison with the supercontinuum generated in uniform fibers, even when subpicosecond pulses of moderate powers are used.

Keywords (OCIS):

  • (060.2390) Fiber optics and optical communications : Fiber optics, infrared
  • (060.4230) Fiber optics and optical communications : Multiplexing
  • (060.5530) Fiber optics and optical communications : Pulse propagation and temporal solitons
  • (320.6629) Ultrafast optics : Supercontinuum generation

Electromagnetic trapping of chiral molecules: Orientational effects of the irradiating beam

  • David Bradshaw and David Andrews
  • received 12/17/2014; accepted 02/20/2015; posted 02/20/2015; Doc. ID 231037
  • [full text: PDF (445) KB)]
  • Abstract: The photonic interaction generally responsible for the electromagnetic trapping of molecules is forward-Rayleigh scattering, a process that is mediated by transition electric dipoles connecting the ground electronic state and virtual excited states. Higher order electric and magnetic multipole contributions to the scattering amplitude are usually negligible. However, on consideration of chiral discrimination effects (in which an input light of left-handed circular polarization can present different observables compared to right-handed polarization, or molecules of opposite enantiomeric form respond differently to a set circular polarization), the mechanism must be extended to specifically accommodate transition magnetic dipoles. Moreover, it is important to account for the fact that chiral molecules are necessarily non-spherical, so that their interactions with a laser beam will have an orientational dependence. Using quantum electrodynamics, this article quantifies the extent of the energetic discrimination that arises when chiral molecules are optically trapped, placing particular emphasis on the orientational effects of the trapping beam. An in-depth description of the intricate ensemble-weighted method used to incorporate the latter is presented. It is thus shown that, when a mixture of molecular enantiomers is irradiated by a continuous beam of circularly polarized light, a difference arises in the relative rates of migration of each enantiomer in and out of the most intense regions of the beam. In consequence, optical trapping can be used as a means of achieving enantiomer separation.

Keywords (OCIS):

  • (020.7010) Atomic and molecular physics : Laser trapping
  • (260.2110) Physical optics : Electromagnetic optics
  • (270.5580) Quantum optics : Quantum electrodynamics
  • (160.1585) Materials : Chiral media
  • (290.2558) Scattering : Forward scattering

Spatially periodic modulation of optical conductivity in doped graphene by two-dimensional diffraction grating

  • Tetsuyuki Ochiai
  • received 01/13/2015; accepted 02/20/2015; posted 02/20/2015; Doc. ID 232500
  • [full text: PDF (1653) KB)]
  • Abstract: We show theoretically that the optical conductivity of doped graphene can exhibit a spatially periodic modulation by a diffraction grating. Doped graphene placed above the grating exhibits a periodic electrostatic potential distribution, resulting in a periodic charge-density redistribution inside the graphene. The optical conductivity of doped graphene depends linearly on the Fermi energy, which is proportional to the square root of the charge density. Therefore, the optical conductivity exhibits a spatial-periodic modulation. The periodicity implies a band structure formation of the graphene plasmon polariton. Band engineering of it is also discussed.

Keywords (OCIS):

  • (230.1950) Optical devices : Diffraction gratings
  • (160.5293) Materials : Photonic bandgap materials
  • (250.5403) Optoelectronics : Plasmonics

Cascaded terahertz-wave generation efficiency in excess of the Manley–Rowe limit using a cavity phase-matched optical parametric oscillator

  • Kyosuke Saito, Tadao Tanabe, and Yutaka Oyama
  • received 11/04/2014; accepted 02/19/2015; posted 02/19/2015; Doc. ID 226041
  • [full text: PDF (461) KB)]
  • Abstract: We describe a scheme for efficient terahertz (THz) generation using a cascaded optical parametric oscillator (cascaded OPO) using a GaP sheet cavity. By choosing an appropriate pump wavelength and cavity design, the cascading process contributes to efficient THz-wave generation, resulting in a high output peak power of 1.8 MW and a high photon conversion efficiency of 1.086 at 3 THz. This exceeds the Manley–Rowe limit, and the method described here is applicable to widely tunable and high-power THz-wave generation using an optically isotropic nonlinear optical material, such as GaAs, InP, ZnTe, or GaP. Our simulated data show that high-power THz sources are possible that are suitable for the realization of nonlinear optical effects at THz frequencies.

Keywords (OCIS):

  • (140.4780) Lasers and laser optics : Optical resonators
  • (190.0190) Nonlinear optics : Nonlinear optics
  • (190.4410) Nonlinear optics : Nonlinear optics, parametric processes

Modeling surface defects in fused silica optics for laser wave propagation

  • Antoine Bourgeade, Laurent Lamaignère, Thierry Donval, Jean Luc Rullier, and Laurent Gallais
  • received 01/07/2015; accepted 02/18/2015; posted 02/19/2015; Doc. ID 232068
  • [full text: PDF (2708) KB)]
  • Abstract: Modulation of the laser intensity caused by surface defects on optical components is a main concern for high power lasers. Among the consequences of this effect, the laser damage occurrence can be magnified on the downstream components in the laser chain. In order to understand the impact of defects on the wave propagation, a specific numerical approach has been developed. The defects are modeled as phase perturbations that are used as an input in either a 1D axi-symmetric code based on finite differences, or a 2D code that uses Fast Fourier Transform. The computations are then used to evaluate the laser intensity modulations generated by CO2 laser induced defects at the surface of fused silica optics. A dedicated damage experiment at 355nm has been carried out for various defect dimensions. Consistent results are found between experiments and simulations, both on the quantitative values of magnitude and positions of the modulations. This study proves that for short propagation distances it is necessary to use exact shape of the defect in the simulations, especially the complex rim structure characteristic of CO2 laser craters.

Keywords (OCIS):

  • (000.4430) General : Numerical approximation and analysis
  • (050.1970) Diffraction and gratings : Diffractive optics
  • (140.3330) Lasers and laser optics : Laser damage

Split-field finite-difference time-domain method for second-harmonic generation in two-dimensionally periodic structures

  • Jorge Francés Monllor, Jani Tervo, Sergi Gallego, Sergio Bleda, Cristian Neipp, and A. Márquez
  • received 01/13/2015; accepted 02/18/2015; posted 02/19/2015; Doc. ID 232421
  • [full text: PDF (439) KB)]
  • Abstract: Split-Field Finite-Difference Time-Domain (SF-FDTD) method is extended to second-harmonic generation in two-dimensionally periodic structures. Making use of the full coefficient-tensor formalism, a coupled nonlinear system of equations, that must be solved at each update of the electromagnetic field, is developed. The accuracy of the method is verified by comparing the results to well-known one-dimensional problems. The results for L-shaped arrays are compared with results obtained with the Fourier modal method.

Keywords (OCIS):

  • (050.1950) Diffraction and gratings : Diffraction gratings
  • (190.4360) Nonlinear optics : Nonlinear optics, devices
  • (050.1755) Diffraction and gratings : Computational electromagnetic methods

Polarisation and Mutual Coupling Effects in Aluminium Nanoantenna Arrays

  • Neciah Dorh, Martin Cryan, and Jamie Stokes
  • received 12/10/2014; accepted 02/17/2015; posted 02/23/2015; Doc. ID 229021
  • [full text: PDF (2310) KB)]
  • Abstract: This paper studies two arm aluminium dipole nanoantennas in both single and 2 x 2 array configurations. Purcell and Power Enhancement results are shown highlighting the importance of including antenna losses when quantifying antenna performance. Point source excitation in the antenna gap is used and the paper studies the effect of different polarizations of this source with respect to the dipole antenna. The paper then studies the impact of source orientation within the 2 x 2 array and shows strong dependence of resonant wavelength and radiation pattern on the distribution of source orientations in the array.

Keywords (OCIS):

  • (240.6680) Optics at surfaces : Surface plasmons
  • (260.5740) Physical optics : Resonance
  • (260.7190) Physical optics : Ultraviolet
  • (250.5403) Optoelectronics : Plasmonics
  • (310.6628) Thin films : Subwavelength structures, nanostructures
  • (240.5440) Optics at surfaces : Polarization-selective devices

Articles 1 to 20 of 45 Next Page >>





Browse Journals / Lookup Meetings

Browse by Journal and Year


   


Lookup Conference Papers

Close Browse Journals / Lookup Meetings