Laser & Photonics Reviews

Cover image for Vol. 8 Issue 6

Early View (Online Version of Record published before inclusion in an issue)

Editor: Katja Paff

Impact Factor: 9.313

ISI Journal Citation Reports © Ranking: 2013: 3/83 (Optics); 9/67 (Physics Condensed Matter); 10/136 (Physics Applied)

Online ISSN: 1863-8899

Associated Title(s): Advanced Optical Materials, Journal of Biophotonics

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  1. 1 - 8
  1. Original Papers

    1. Broadband amplification of spoof surface plasmon polaritons at microwave frequencies

      Hao Chi Zhang, Shuo Liu, Xiaopeng Shen, Lin Hui Chen, Lianming Li and Tie Jun Cui

      Article first published online: 21 NOV 2014 | DOI: 10.1002/lpor.201400131

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      Efficient amplification of spoof surface plasmon polaritons (SPPs) is proposed at microwave frequencies by using a subwavelength-scale amplifier. For this purpose, a special plasmonic waveguide composed of two ultrathin corrugated metallic strips on top and bottom surfaces of a dielectric substrate with mirror symmetry is presented, which is easy to integrate with the amplifier. It is shown that spoof SPPs are able to propagate on the plasmonic waveguide in broadband with low loss and strong subwavelength effect. By loading a low-noise amplifier chip produced by the semiconductor technology, the first experiment is demonstrated to amplify spoof SPPs at microwave frequencies (from 6 to 20GHz) with high gain (around 20dB), which can be directly used as a SPP amplifier device. The features of strong field confinement, high efficiency, broadband operation, and significant amplification of the spoof SPPs may advance a big step towards other active SPP components and integrated circuits.

    2. Guiding light through optical bound states in the continuum for ultrahigh-Q microresonators

      Chang-Ling Zou, Jin-Ming Cui, Fang-Wen Sun, Xiao Xiong, Xu-Bo Zou, Zheng-Fu Han and Guang-Can Guo

      Article first published online: 6 NOV 2014 | DOI: 10.1002/lpor.201400178

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      A light confinement mechanism is proposed based on the photonic bound state in the continuum. In low-refractive-index photonic structures on a high-refractive-index membrane, optical dissipation to the continuum can be forbidden because of the destructive interference of various leakage channels, without the requirement of other high-refractive-index materials.

    3. Unveiling the correlation between non-diffracting tractor beam and its singularity in Poynting vector

      Dongliang Gao, Andrey Novitsky, Tianhang Zhang, Fook Chiong Cheong, Lei Gao, Chwee Teck Lim, Boris Luk'yanchuk and Cheng-Wei Qiu

      Article first published online: 6 NOV 2014 | DOI: 10.1002/lpor.201400071

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      This paper investigates the singular optics of nonparaxial light beams in the near field when the light behaves as a tractor beam. New insights into the optical pulling force, which is usually represented by integrating the stress tensor at a black box enclosing the object, are interpreted by the optical singularity of the Poynting vector. The negative nonconservative pulling force originates from the transfer of the azimuthal Poynting vector to the longitudinal component partly owing to the presence of a scatterer. The separatrice pattern and singularity shifts of the Poynting vector unanimously exhibit a differentiable near-field distribution in the presence of optical pulling force. A new method is established to calculate the near-field optical force using the differential Poynting vector in the far field. The results obtained provide a clear physical interpretation of the light–matter interaction and manifest the significance of singular optics in manipulating objects.

  2. Review Articles

    1. Monolithic silicon-micromachined free-space optical interferometers onchip

      Yasser M. Sabry, Diaa Khalil and Tarik Bourouina

      Article first published online: 5 NOV 2014 | DOI: 10.1002/lpor.201400069

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      The integration of microactuators within a silicon photonic chip gave rise to the field of optical micro-electro-mechanical systems (MEMS) that was originally driven by the telecommunication market. Following the latter's bubble collapse in the beginning of the third millennium, new directions of research with considerable momentum appeared focusing on the realization and applications of miniaturized instrumentation in biology, chemistry, physics and materials science. At the heart of these applications light interferometry is a key optical phenomenon, in which miniaturized scanning interferometers are the manipulating optical devices. Monolithic free-space optical interferometers realized on a silicon chip take advantage of the recent progress in the microfabrication technology that is enabling accurate control of the etching depth, the aspect ratio, the verticality and the curvature of the etched surfaces. The fabrication technology, the library of micro-optical and mechanical components, the realized architectures and their characterization are described in detail in this review, followed by a discussion of the foreseen challenges.

  3. Original Papers

    1. Generation of sub-terahertz repetition rates from a monolithic self-mode-locked laser coupled with an external Fabry-Perot cavity

      Y. F. Chen, M. T. Chang, W. Z. Zhuang, K. W. Su, K. F. Huang and H. C. Liang

      Article first published online: 29 OCT 2014 | DOI: 10.1002/lpor.201400132

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      A novel scheme to multiply the repetition rate of a monolithic self-mode-locked laser for generating sub-terahertz pulse sources is realized. A partially reflective mirror is exploited to form an external Fabry-Perot cavity. The pulse trains with the pth harmonics of the repetition rate can be flexibly obtained by adjusting the external cavity length to be a simple fraction of the crystal length.2

  4. Review Articles

    1. You have full text access to this OnlineOpen article
      Waveguide sub-wavelength structures: a review of principles and applications

      Robert Halir, Przemek J. Bock, Pavel Cheben, Alejandro Ortega-Moñux, Carlos Alonso-Ramos, Jens H. Schmid, Jean Lapointe, Dan-Xia Xu, J. Gonzalo Wangüemert-Pérez, Íñigo Molina-Fernández and Siegfried Janz

      Article first published online: 30 SEP 2014 | DOI: 10.1002/lpor.201400083

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      Periodic structures with a sub-wavelength pitch have been known since Hertz conducted his first experiments on the polarization of electromagnetic waves. While the use of these structures in waveguide optics was proposed in the 1990s, it has been with the more recent developments of silicon photonics and high-precision lithography techniques that sub-wavelength structures have found widespread application in the field of photonics. This review first provides an introduction to the physics of sub-wavelength structures. An overview of the applications of sub-wavelength structures is then given including: anti-reflective coatings, polarization rotators, high-efficiency fiber–chip couplers, spectrometers, high-reflectivity mirrors, athermal waveguides, multimode interference couplers, and dispersion engineered, ultra-broadband waveguide couplers among others. Particular attention is paid to providing insight into the design strategies for these devices. The concluding remarks provide an outlook on the future development of sub-wavelength structures and their impact in photonics.

    2. You have full text access to this OnlineOpen article
      Fiber optical parametric amplifiers in optical communication systems

      Michel E. Marhic (†), Peter A. Andrekson, Periklis Petropoulos, Stojan Radic, Christophe Peucheret and Mahmoud Jazayerifar

      Article first published online: 30 SEP 2014 | DOI: 10.1002/lpor.201400087

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      The prospects for using fiber optical parametric amplifiers (OPAs) in optical communication systems are reviewed. Phase-insensitive amplifiers (PIAs) and phase-sensitive amplifiers (PSAs) are considered. Low-penalty amplification at/or near 1 Tb/s has been achieved, for both wavelength- and time-division multiplexed formats. High-quality mid-span spectral inversion has been demonstrated at 0.64 Tb/s, avoiding electronic dispersion compensation. All-optical amplitude regeneration of amplitude-modulated signals has been performed, while PSAs have been used to demonstrate phase regeneration of phase-modulated signals. A PSA with 1.1-dB noise figure has been demonstrated, and preliminary wavelength-division multiplexing experiments have been performed with PSAs. 512 Gb/s have been transmitted over 6,000 km by periodic phase conjugation. Simulations indicate that PIAs could reach data rate x reach products in excess of 14,000 Tb/s × km in realistic wavelength-division multiplexed long-haul networks. Technical challenges remaining to be addressed in order for fiber OPAs to become useful for long-haul communication networks are discussed.

  5. Errata

    1. Recent advances in bioluminescence tomography: methodology and system as well as application

      C. Qin, J. Feng, S. Zhu, X. Ma, J. Zhong, P. Wu, Z. Jin and J. Tian

      Article first published online: 1 OCT 2012 | DOI: 10.1002/lpor.201270011

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