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Optics Letters

Pintu Ghosh, Jinsheng Lu, Hao Luo, Ziquan Xu, Xiaoyuan Yan, Yewu Wang, Jun Lu, Min Qiu, Qiang Li
A technique to fabricate nanogaps with controllably variable gap width in silver (Ag) nanowires (NWs) by photothermal-induced stress utilizing a focused continuous-wave laser (532 nm) is presented. For the case of an Ag NW on gold thin film, a gap width starting from ∼20  nm is achieved with a critical minimum power (CMP) of about 160 mW, whereas in the case of an Ag NW placed on top of a zinc oxide NW, the attained gap width is as small as a few nm (<10  nm) with a CMP of only ∼100  mW...
May 15, 2018: Optics Letters
Jingjing Liu, Xiaoyue Feng, Xiuwei Fan, Zhen Zhang, Bo Zhang, Jie Liu, Liangbi Su
An Er3+ -doped CaF2 -SrF2 mixed crystal was grown using the temperature gradient technique, and its laser characteristics were studied. In a compact linear cavity, a continuous-wave output power of 712 mW was obtained with the highest slope efficiency of 41.4%. Using a semiconductor saturable absorber mirror, a passive Q-switched mode-locked Er3+ :CaF2 -SrF2 laser emitting at 2729.5 nm was demonstrated for the first time, to the best of our knowledge. The maximum average output power of 125 mW was obtained at an absorbed pump power of 1...
May 15, 2018: Optics Letters
Qinjiang Fu, Jingdong Zhang, Chuancan Liang, Iroegbu Paul Ikechukwu, Guolu Yin, Lei Lu, Yifan Shao, Liu Liu, Dongxiao Liu, Tao Zhu
In this Letter, we demonstrated an intensity-modulated directional torsion sensor based on an in-line Mach-Zehnder interferometer in single-mode fiber. A non-circular symmetric perturbation is created to excite non-circular symmetric cladding mode and then interference with the core mode at the second perturbation. An initial rotation angle is designed between two perturbations for the purpose of discriminating the torsion direction. Both experimental and theoretical results enforce that the spectral peak/dip turns to be the dip/peak when the fiber is twisted from the counter-clockwise to the clockwise direction...
May 15, 2018: Optics Letters
S G Castillo-López, N M Makarov, F Pérez-Rodríguez
The resonant quantization of Landau damping in far-infrared absorption spectra of metal nano-thin films is predicted within the Kubo formalism. Specifically, it is found that the discretization of the electromagnetic and electron wave numbers inside a metal nanoslab produces quantum nonlocal resonances well-resolved at slab thicknesses smaller than the electromagnetic skin depth. Landau damping manifests itself precisely as such resonances, tracing the spectral curve obtained within the semiclassical Boltzmann approach...
May 15, 2018: Optics Letters
Yong Geng, Xiatao Huang, Wenwen Cui, Yun Ling, Bo Xu, Jin Zhang, Xingwen Yi, Baojian Wu, Shu-Wei Huang, Kun Qiu, Chee Wei Wong, Heng Zhou
We demonstrate seamless channel multiplexing and high bitrate superchannel transmission of coherent optical orthogonal frequency division multiplexing (CO-OFDM) data signals utilizing a dissipative Kerr soliton (DKS) frequency comb generated in an on-chip microcavity. Aided by comb line multiplication through Nyquist pulse modulation, the high stability and mutual coherence among mode-locked Kerr comb lines are exploited for the first time, to the best of our knowledge, to eliminate the guard intervals between communication channels and achieve full spectral density bandwidth utilization...
May 15, 2018: Optics Letters
Moshe Ben Ayun, Egor Liokumovitch, Daniel Gotliv, Shmuel Sternklar
We present a new technique for improving the sensitivity of an interferometer, phase-shift-amplified interferometry (PAI), which is based on two embedded interferometers. The internal interferometer, which is biased in anti-phase, amplifies the phase shift; the external interferometer converts this into an amplified intensity shift. PAI can improve the sensitivity of standard interferometers by an order of magnitude or more. The theory of PAI, including its enhanced immunity to relative intensity noise, phase noise, and other post-detection noise and distortion components, is presented...
May 15, 2018: Optics Letters
Gregory T Forcherio, Jérémy Riporto, Jeremy R Dunklin, Yannick Mugnier, Ronan Le Dantec, Luigi Bonacina, D Keith Roper
This erratum corrects errors in the expressions for ⟨βTMD ⟩ and fitted form of IHRS and a consequent data point in Fig. 4 of a recent Letter [Opt. Lett.42, 5018 (2017)OPLEDP0146-959210.1364/OL.42.005018]. It also supplies data for the reference compound para-nitroaniline (pNA). The correction to ⟨βTMD ⟩ improves experimental agreement from 46% to within 21% of independent scissors-corrected density functional theory (DFT) calculations. Central findings from the original Letter remain intact.
May 15, 2018: Optics Letters
Kristina Bagnell, Anthony Klee, Peter J Delfyett, Jason J Plant, Paul W Juodawlkis
An optical frequency comb with mode spacing of 10 GHz operating in the c-band is produced from a harmonically mode-locked laser using a slab-coupled optical waveguide amplifier device with a fiber-coupled external cavity. An intracavity Fabry-Perot etalon serves as a high finesse optical filter for supermode suppression and as the reference for cavity length stabilization using a multi-combline Pound-Drever-Hall setup. The Allan deviation of a single optical combline near 193.4 THz is measured via a heterodyne beat with a cavity stabilized cw laser and reaches a minimum fractional frequency deviation of 3×10-13 at τ=30  ms...
May 15, 2018: Optics Letters
Long Li, Runzhou Zhang, Guodong Xie, Yongxiong Ren, Zhe Zhao, Zhe Wang, Cong Liu, Haoqian Song, Kai Pang, Robert Bock, Moshe Tur, Alan E Willner
In this Letter, we experimentally demonstrate beaconless beam displacement tracking for free-space optical communication link multiplexing multiple orbital angular momentum (OAM) beams, where the data-carrying OAM beams are used for position detection. 400 Gbit/s data transmission is demonstrated under emulated lateral displacement of up to ±10  mm with power penalties of less than 3 dB for all channels. Channel crosstalk is reduced by the beam tracking system to below -18  dB. Moreover, we investigate using a Gaussian beacon for beam displacement tracking, and achieve similar channel crosstalk and power penalties, compared with using the beaconless beam tracking...
May 15, 2018: Optics Letters
Jiang Zhu, Junxiao Yu, Yueqiao Qu, Youmin He, Yan Li, Qiang Yang, Tiancheng Huo, Xingdao He, Zhongping Chen
Optical coherence elastography (OCE) is an emerging imaging modality for the assessment of mechanical properties in soft tissues. Transverse shear wave measurements using OCE can quantify the elastic moduli perpendicular to the force direction, however, missing the elastic information along the force direction. In this study, we developed coaxial excitation longitudinal shear wave measurements for quantification of elastic moduli along the force direction using M-scans. Incorporating Rayleigh wave measurements using non-coaxial lateral scans into longitudinal shear wave measurements, directionally dependent elastic properties can be quantified along the force direction and perpendicular to the force direction...
May 15, 2018: Optics Letters
Christian Nadell, Kebin Fan, Willie Padilla
Diffractive optics has long served as the basis of spectroscopic measurements of materials. Operation in the resonance domain further allows these elements to achieve high efficiency and polarization control. An effective grating theory is a practical tool for modeling such optics, and here we extend use of this theory to the terahertz region, experimentally demonstrating an all-dielectric binary off-axis diffractive lens. We achieve a high-efficiency, polarization-independent optic that both focuses and disperses terahertz light, suggesting potential applications in pharmaceutical, security, and semiconductor imaging...
May 15, 2018: Optics Letters
Naoki Ishida, Takaaki Nakamura, Touta Tanaka, Shota Mishima, Hiroki Kano, Ryota Kuroiwa, Yuhei Sekiguchi, Hideo Kosaka
We demonstrate universal non-adiabatic non-abelian holonomic single quantum gates over a geometric electron spin with phase-modulated polarized light and 93% average fidelity. This allows purely geometric rotation around an arbitrary axis by any angle defined by light polarization and phase using a degenerate three-level Λ-type system in a negatively charged nitrogen-vacancy center in diamond. Since the control light is completely resonant to the ancillary excited state, the demonstrated holonomic gate not only is fast with low power, but also is precise without the dynamical phase being subject to control error and environmental noise...
May 15, 2018: Optics Letters
G Piquero, M Santarsiero, R Martínez-Herrero, J C G de Sande, M Alonzo, F Gori
Partially coherent sources with radial coherence are proposed. They present a circularly symmetric intensity profile and a degree of coherence whose absolute value only depends on the angular difference between the two considered points. In particular, the source is completely coherent at pairs of points belonging to the same radius. The modal structure of such sources is determined in the general case, and conditions are derived under which the field propagated in paraxial approximation remains radially coherent at any transverse plane...
May 15, 2018: Optics Letters
Peixiong Zhang, Nan Chen, Rui Wang, Xingbin Huang, Siqi Zhu, Zhen Li, Hao Yin, Zhenqiang Chen
The use of Yb3+ codoping for enhancing the near-infrared (NIR) emission in Bi, Yb codoped PbF2 crystal was investigated for the first time, to the best of our knowledge. The NIR and visible fluorescence emission properties of the as-grown crystals were investigated in detail. It was found that the Yb3+ ion can act as an effective charge compensated ion to bring about the conversion from Bi2+ to Bi+ , enhancing the NIR fluorescence emission in Bi:PbF2 crystal. Moreover, the NIR fluorescence emission peaking at around 1090 and 1485 nm was demonstrated to be two different Bi+ related centers, Bi(I) and Bi(II), respectively...
May 15, 2018: Optics Letters
Matthew N Julian, David G MacDonnell, Mool C Gupta
A binary phase diffractive optical element photon sieve is fabricated by direct laser ablation of a thin, flexible polyimide substrate with a nanosecond-pulsed ultraviolet laser. The binary phase photon sieve operates at 633 nm and was designed with 19 rings and a focal length of 400 mm. The total time to fabricate the photon sieves was tens of seconds. The surface properties of the laser-processed areas are examined, and the optical performance of the photon sieve is characterized and compared to FDTD simulations...
May 15, 2018: Optics Letters
Maxim Demesh, Anatol Yasukevich, Viktor Kisel, Elena Dunina, Alexey Kornienko, Vladimir Dashkevich, Valentin Orlovich, Elena Castellano-Hernández, Christian Kränkel, Nikolay Kuleshov
Eu3+ -doped LiYF4 is reexamined as a laser material for the visible spectral region. Polarized absorption and emission cross sections as well as the fluorescence lifetime are determined. Branching ratios and radiative lifetime are calculated within the theory of 4f-4f transition intensities, which takes into account the influence of an excited configuration of the opposite parity 4fN-1 5d. Continuous-wave laser operation at 702 nm is demonstrated with a maximum output power of 15 mW and a slope efficiency of 4...
May 15, 2018: Optics Letters
Jesús Daniel Valenzuela-Sau, Raúl García-Llamas
We calculated the out-of-plane band structure of a two-dimensional dispersive photonic crystal (PC). To achieve this goal, the plane wave expansion method was implemented in conjunction with a numerical algorithm, the dispersive photonic crystal iterative method. The PC is an array of circular cross-sectional dispersive MgO Lorentz single-pole rods in a square lattice. The frequency bands are calculated starting at Γ as a function of the oblique component of the wave vector. For the lowest frequencies, it was found that the modes bend drastically to the horizon as the dielectric constant ϵ(ω) is increased to a very positive value...
May 15, 2018: Optics Letters
Fan Wang, Zhiquan Lin, Chongyun Shao, Qinling Zhou, Lei Zhang, Meng Wang, Danping Chen, Guojun Gao, Shikai Wang, Chunlei Yu, Lili Hu
The laser behavior of a centimeter-scale Er3+ /Al3+ codoped silica fiber with core numerical aperture and core diameter of 0.15 and 8 μm, respectively, is reported. The core glass was prepared by the sol-gel method combined with high-temperature sintering; it contained Er3+ ion concentration as high as 1.32×1020   ions/cm3 and an Al/Er mole ratio of 10. The high doping homogeneity of Er3+ ions in the fiber core was confirmed by an electron probe microanalyzer element scanning, long Er3+ :  I13/2 4 emission lifetime of 11...
May 15, 2018: Optics Letters
Jin-Hyeon Yun, Alexander Y Polyakov, Kyu-Cheol Kim, Yeon Tae Yu, Donghyun Lee, In-Hwan Lee
We propose stretchable plasmonic templates of Au and Au/SiO2 nanoparticles (NPs) to improve the luminescence of CsPbBr3 perovskite nanocrystals (PNCs). These templates are highly flexible and consist of polymer-metal NP composites that facilitate the luminescence enhancement by localized surface plasmons (LSPs) due to coupling with metal NP. This template also prevents the degradation of carrier transport properties for perovskite light-emitting diodes by embedding metal NPs in polymer. The luminescence of PNC film on the template with Au NPs decreases by 21% compared to PNC films on the reference (polymer film without metal NPs), while it increases by 54% for the templates with Au/SiO2 NPs...
May 15, 2018: Optics Letters
Liang Tian, Fei Wang, Yuanda Wu, Yunji Yi, Xiaoqiang Sun, Daming Zhang
A polymer/silica hybrid integration add-drop filter based on a grating-assisted contradirectional coupler fabricated through simple and low-cost contact lithography is proposed. First, the structure pattern of the add-drop filter was formed in the lower silica cladding by contact lithography and inductively coupled plasma (ICP) etching. Then an SU-8 film was fabricated on top of it by a spin-coating method, and an inverted-rib waveguide structure was formed. Next, the slab layer of the inverted-rib waveguide was removed by ICP etching...
May 15, 2018: Optics Letters
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