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Optics Letters

M Pang, W He, P St J Russell
We report a Tm-doped soliton fiber laser passively mode-locked by intense optoacoustic interactions in a short length of solid-core silica photonic crystal fiber (PCF) with a nanobore in core-center. A repetition rate of 1.446 GHz pulse is achieved, corresponding to the 52nd harmonic of the 27.8 MHz cavity round-trip frequency. Strong optoacoustic interactions in this PCF-based, Tm-doped fiber laser ensure stable and repeatable gigahertz-rate pulse train generation at 1.85 μm wavelength, with a high supermode noise suppression ratio and low pulse timing jitter...
October 1, 2016: Optics Letters
K Yamane, M Sakamoto, N Murakami, R Morita, K Oka
A novel method of ultrafast rotation of a ring-shaped optical lattice in the picosecond time region was proposed and demonstrated. Our ring-lattice generator was assembled by a pair of linearly chirped pulses with a time delay, a high-order birefringent retarder, and an axially symmetric polarization element. Using a mode-locked Ti:sapphire laser oscillator as a light source, stable two-, four-, and six-petaled ring-lattice rotations were demonstrated with the rotation periods of 1.6, 3.2, and 4.8 ps, respectively...
October 1, 2016: Optics Letters
Olga Borovkova, Andrey Kalish, Vladimir Belotelov
We propose a novel method to enhance the transverse magneto-optical Kerr effect (TMOKE) in the magneto-plasmonic (MP) nanostructures by means of the active dielectric layer. We report the theoretical analysis of the MP structure with a ferromagnetic dielectric doped with rear-earth ions (Nd<sup>3+</sup>) as the example of a gain layer. The enhancement takes place near the surface plasmon polariton (SPP) resonances of the nanostructures. The stimulated emission of the dopants in the field of the SPP wave partially compensates its losses...
October 1, 2016: Optics Letters
Matthias Justen, Christopher Bonzon, Keita Ohtani, Mathias Beck, Urs Graf, Jerome Faist
2×2 parallel fed and 3×3 serial fed patch antenna arrays on a benzocyclobutene (BCB) polymer layer are integrated with a 70 μm wide, dry etched, double metal waveguide quantum cascade laser, operating at about 1.9 THz. The BCB surrounds the quantum cascade laser ridge and is planarized to fit precisely its height. The patch antenna arrays emit a linearly polarized, highly symmetric beam perpendicular to the antenna plane. The beams have a FWHM angle of 49° (2×2) and 35° (3×3). Both measurements and simulations indicate coupling factors to a Gaussian beam of over 90%...
October 1, 2016: Optics Letters
Ke Hu, Hui-Chun Wu
We study x-ray production by coherent nonlinear Thomson scattering of few-cycle laser pulses from relativistic electron sheets. For an electron sheet thicker than the wavelength of the x-ray, the scattering efficiency is found to increase by two orders of magnitude for single-cycle laser pulses, as compared with longer pulses. This enhancement is attributed to the suppression of the destructive interference during the scattering process, as well as the frequency downshift related to the ultrabroad spectra of single-cycle pulses...
October 1, 2016: Optics Letters
Priten Savaliya, Anuj Dhawan
Employing finite difference time domain simulations, we demonstrate that electromagnetic field enhancement is substantially greater for tapered optical fibers with plasmonic nanostructures present on their tips as compared with non-tapered optical fibers having those plasmonic nanostructures, or with tapered optical fibers without the plasmonic nanostructures. We also carried out fabrication of plasmonic nanostructures on optical fiber tips.
October 1, 2016: Optics Letters
Bofeng Zhu, Guobin Ren, Beilei Wu, Yixiao Gao, Haisu Li, Shuisheng Jian
In this Letter, we investigate the nanofocusing of hybrid plasmons-phonons-polaritons (SPP-HPhPs) in a graphene-hexagonal boron nitride (h-BN) heterostructure with a graphene coating on a tapered h-BN slab. Compared with the hyperbolic phonon polariton (HPhP) in h-BN, the hybrid SPP-HPhP in a heterostructure exhibits much smaller losses, which is validated through both analytical and numerical methods. Furthermore, the thickness dependent dispersions of a hybrid SPP-HPhP enable the tapered heterostructure to achieve a function of focusing electromagnetic waves...
October 1, 2016: Optics Letters
Xiaojie Guo, Xiaocheng Wang, Zhaohui Li, Yi Dong
We propose to use a parametric mixer in a passive phase correction scheme for stable distribution of a millimeter-wave signal over fiber links. The parametric mixer is realized via ultrafast four-wave mixing processes, thereby overcoming the bandwidth limit of conventional electronic devices. The mixing of round-trip probe and local pumps generates a signal immune to transmission delay fluctuations at the remote end. This scheme is validated by an experiment that distributes a 36-GHz millimeter wave over 20-km optical fiber...
October 1, 2016: Optics Letters
Shotaro Kitajima, Hiroaki Nakao, Akira Shirakawa, Hideki Yagi, Takagimi Yanagitani
Yb:LuAG is a promising gain medium for high-power lasers due to its high thermal conductivity and large emission cross section. Although narrowband gain media such as Yb:LuAG are not considered to be suitable for the generation of sub-100 fs pulses, we have achieved generation of 91 fs pulses with Yb:LuAG ceramic by the Kerr-lens mode-locking (KLM) technique. The obtained average power, pulse energy, and peak power were 1.64 W, 20.0 nJ, and 220 kW, respectively. These are, to the best of our knowledge, the first demonstration of KLM and the new records based on both Yb:LuAG ceramic and single crystal...
October 1, 2016: Optics Letters
Irene Estévez, Victor Sopo, Angel Lizana, Alex Turpin, Juan Campos
We propose a new complete snapshot Stokes polarimeter based on a single biaxial crystal. It presents different strengths (snapshot, complete polarimetric measurements, large data redundancy, and high sensitivity) in a simple and compact optical arrangement. The polarimeter is experimentally implemented and analyzed in terms of accuracy and repeatability.
October 1, 2016: Optics Letters
Quan Xu, Xiaoqiang Su, Chunmei Ouyang, Ningning Xu, Wei Cao, Yuping Zhang, Quan Li, Cong Hu, Jianqiang Gu, Zhen Tian, Abul K Azad, Jiaguang Han, Weili Zhang
Recently reported active metamaterial analogues of electromagnetically induced transparency (EIT) are promising in developing novel optical components, such as active slow light devices. However, most of the previous works have focused on manipulating the EIT resonance strength at a fixed characteristic frequency and, therefore, realized on-to-off switching responses. To further extend the functionalities of the EIT effect, here we present a frequency tunable EIT analogue in the terahertz regime by integrating photoactive silicon into the metamaterial unit cell...
October 1, 2016: Optics Letters
Lipin Chen, Bolin Fan, Wenbo Yan, Shaobei Li, Lihong Shi, Hongjian Chen
We demonstrate an active and controllable photo-assisted splitting of dielectric microdroplets inside a LiNbO<sub>3</sub>-based sandwich structure by utilizing the pyroelectric and photovoltaic effects of LiNbO<sub>3</sub> crystals. Basing on electrostatic simulation results, the mechanism of the photo-assisted splitting is explained; meanwhile, the microdoplet pre-polarizing and the inclined electrostatic force induced by the photovoltaic charges inside the sandwich structure are emphasized...
October 1, 2016: Optics Letters
Kevin Cook, Geoffrey Balle, John Canning, Loïc Chartier, Tristan Athanaze, M A Hossain, Chunyang Han, Jade-Edouard Comatti, Yanhua Luo, Gang-Ding Peng
Optical fiber is drawn from a dual-head 3D printer fabricated preform made of two optically transparent plastics with a high-index core (NA∼0.25, V>60). The asymmetry observed in the fiber arises from asymmetry in the 3D printing process. The highly multimode optical fiber has losses measured by cut-back as low as α∼0.44  dB/cm in the near IR.
October 1, 2016: Optics Letters
Yi-Shan Lee
We demonstrate a combined experimental and theoretical investigation of the polarization properties of the strong coupling between fine structure-split excitons and anisotropy-split cavity modes. While the temperature is varied to control the light-matter coupling, we observe a notable change in the emission polarization for the branch of the exciton-like polariton. The exciton dephasing is introduced in order to explain the temperature-sensitive effect on the emission polarization. We apply the medium-dependent Green function approach involving the polarization-dependent exciton dephasing to model the emission spectra, which shows qualitative agreement with our experimental results...
October 1, 2016: Optics Letters
Qi Mo, Jiale He, Dawei Yu, Lei Deng, Songnian Fu, Ming Tang, Deming Liu
We experimentally demonstrate a 4.46  Gb/s2×2 multi-input multi-output (MIMO) orthogonal frequency division multiplexing (OFDM)/OQAM radio signal over a 2 km elliptical core 3-mode fiber, together with 0.4 m wireless transmission. Meanwhile, to cope with differential channel delay (DCD) among involved MIMO channels, we propose a time-offset crosstalk cancellation algorithm to extend the DCD tolerance from 10 to 60 ns without using a circle prefix (CP), leading to an 18.7% improvement of spectral efficiency...
October 1, 2016: Optics Letters
Gauthier Briere, Benoit Cluzel, Olivier Demichel
Although epsilon-near-zero (ENZ) metamaterials offer many unconventional ways to play with light, the optical impedance mismatch with surroundings can limit the efficiency of future devices. We report here on the improvement of the transmittance of an ENZ wavefront shaper. In this Letter, we first address the way to enhance the transmittance of a plane wave through a layer of ENZ material, thanks to a numerical optimization approach based on the transfer matrix method. We then transpose the one-dimensional approach to a two-dimensional case where the emission of a dipole is shaped into a plane wave by an ENZ device with a design that optimizes the transmittance...
October 1, 2016: Optics Letters
Po-Ya Wu, Hsuan-Hao Lu, Ching-Zhe Weng, Yen-Hung Chen, Shang-Da Yang
The phase retrieval algorithm of a frequency-resolved optical gating (FROG) is generalized to handle traces seriously distorted by group delay dispersion and non-uniform phase-matching spectra arising from the nonlinear crystal. In our proof-of-concept experiments, 15 mm thick aperiodically poled lithium niobate was employed in FROG, and successfully reconstructed chirped signal pulses were actually stretched by >5 times inside the crystal. This method is particularly promising in the measurement of weak few-cycle pulses produced by supercontinuum generation in fibers...
October 1, 2016: Optics Letters
Quanbo Jiang, Aline Pham, Serge Huant, Joel Bellessa, Cyriaque Genet, Aurélien Drezet
We report a highly efficient generation of singular surface plasmon (SP) fields by an achiral plasmonic structure consisting of Λ-shaped apertures. Our quantitative analysis, based on leakage radiation microscopy (LRM), demonstrates that the induced spin-orbit coupling can be tuned by adjusting the apex angle of the Λ-shaped aperture. Specifically, the array of Λ-shaped apertures with the apex angle 60° is shown to give rise to the directional coupling efficiency. The ring of Λ-shaped apertures with the apex angle 60° was found to generate the maximum extinction ratio (ER=11) for the SP singularities between two different polarization states...
October 1, 2016: Optics Letters
Di Liu, Yizhi Liang, Long Jin, Huojiao Sun, Linghao Cheng, Bai-Ou Guan
We have developed highly sensitive photonic ultrasound hydrophones based on polymer-packaged dual-polarization-mode fiber lasers. The incident ultrasound wave is scattered by the polymer cylinder due to the difference in elastic property. The scattered wave can drive harmonic vibration of the cylinder and result in optical response in terms of beat-frequency variation of the laser output. Experimental results exhibit a broadband ultrasound response at frequencies below 1 MHz. The individual vibration modes are excited by the ultrasound waves with different efficiencies, yielding a frequency-dependent response...
October 1, 2016: Optics Letters
Jae K Jang, Miro Erkintalo, Jochen Schröder, Benjamin J Eggleton, Stuart G Murdoch, Stéphane Coen
We demonstrate the operation of an all-optical buffer based on temporal cavity solitons stored in a nonlinear passive fiber ring resonator. Unwanted acoustic interactions between neighboring solitons are suppressed by modulating the phase of the external laser driving the cavity. A new locking scheme is presented that allows the buffer to operate with an arbitrarily large number of cavity solitons in the loop. Experimentally, we are able to demonstrate the storage of 4536 bits of data, written all optically into the fiber ring at 10  Gb/s for 1 min...
October 1, 2016: Optics Letters
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