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Photonics Research

Photonics Research

| A joint OSA/Chinese Laser Press publication

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Accepted papers to appear in an upcoming issue

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Articles 1 to 7 of 7

July


Perovskite-based low-cost and high-efficiency hybrid halide solar cells

  • Min Gu, Jiandong Fan, and Baohua Jia
  • received 05/12/2014; accepted 07/10/2014; posted 07/16/2014; Doc. ID 211989
  • [full text: PDF (1465) KB)]
  • Abstract: A cost-effective and high-throughput material named perovskites has proved to be capable of converting 15.9% of the solar energy to electricity, compared to an efficiency of 3.8% that was obtained only 4 years ago. It has already outperformed most of the thin film solar cell technologies that researchers have been studying for decades. Recently, the architecture of perovskite solar cells has been simplified from the traditional dye-sensitized solar cells to the planar-heterojunction solar cells (p-i-n). Currently, the performances of perovskites in solar cells have attracted intensive attentions and studies. Foreseeably, many transformative steps will be put forward over the coming few years. In this review, we summarize the recent exciting development in pervoskite solar cells, and discuss the fundamental mechanisms of perovskite materials in solar cells and their structural evolution. In addition, the future directions and prospects are proposed towards high efficiency perovskite solar cells for practical applications.

Keywords (OCIS):

  • (040.5350) Detectors : Photovoltaic
  • (250.0250) Optoelectronics : Optoelectronics
  • (310.0310) Thin films : Thin films

Introduction to Microwave Photonics Feature Issue

  • Jianping Yao, Josa Capmany, and Kun Xu
  • received 07/09/2014; accepted 07/09/2014; posted 07/09/2014; Doc. ID 216684
  • [full text: PDF (226) KB)]
  • Abstract: Microwave photonics is a field that studies the interaction between microwave and optical waves for the generation, processing, control and distribution of microwave signals by means of photonics. The key advantages of using photonics for microwave applications include wide bandwidth, low loss, and large tunability. In addition, the distribution of microwave signals over optical fibers can avoid a serious problem, electromagnetic interferences, especially in an electromagnetic-complex environment. The intention of this feature issue is to provide participants of the 2013 Asia Communications and Photonics Conference (ACP2013) with an opportunity to publish an account of their microwave photonics research as a peer-reviewed archival paper.

Keywords (OCIS):

  • (010.1080) Atmospheric and oceanic optics : Active or adaptive optics
  • (010.1100) Atmospheric and oceanic optics : Aerosol detection
  • (010.1110) Atmospheric and oceanic optics : Aerosols

June


(MWP)Optical single sideband polarization modulation for radio-over-fiber system and microwave photonic signal processing

  • Shilong Pan, Fangzheng Zhang, and Yamei Zhang
  • received 03/17/2014; accepted 06/28/2014; posted 07/01/2014; Doc. ID 208376
  • [full text: PDF (1397) KB)]
  • Abstract: An approach to implementing optical single sideband (OSSB) polarization modulation, which is a combination of two orthogonally polarized OSSB modulations with complementary phase differences between the optical carrier and the sideband, is demonstrated based on two cascaded polarization modulators (PolMs). The two PolMs are driven by two RF signals that are 90 degree out of phase. By properly adjusting the polarization state between the two PolMs, OSSB polarization modulation with large operation bandwidth can be realized. An experiment is performed. OSSB polarization modulation with an operation bandwidth from 2- to 35-GHz is successfully demonstrated. The spectral profile of the OSSB polarization-modulated signal is observed through an optical spectrum analyzer (OSA), and its complementary phase properties are analyzed by sending the signal to a photo-detector (PD) for square-law detection. Due to the complementary phase differences between the optical carrier and the sideband along the two polarization directions, no microwave frequency component is generated after the PD. The generated OSSB polarization-modulated signal is transmitted through a 25- and a 50- km single mode fiber (SMF) with a 50 Mbaud 16 quadrature amplitude modulation (QAM) baseband data to investigate the transmission performance of the proposed system in radio-over-fiber applications, and very small error vector magnitude (EVM) degradation is observed. The OSSB polarization modulation is also employed to realize a microwave photonic phase shifter. A full-range tunable phase shift is obtained for 2- and 35-GHz microwave signals.

Keywords (OCIS):

  • (060.5625) Fiber optics and optical communications : Radio frequency photonics
  • (130.4110) Integrated optics : Modulators

(MWP) Laser sources for advanced microwave to millimeter-wave applications.

  • Loic Morvan, Frederic Van Dijk, Mickaël Faugeron, Perrine Berger, Gaël Kervella, Grégoire Pillet, Maxin jeremy, Hadrien Lanctuit, and Daniel Dolf
  • received 04/02/2014; accepted 06/24/2014; posted 07/01/2014; Doc. ID 209290
  • [full text: PDF (1956) KB)]
  • Abstract: We present several laser sources dedicated to advanced microwave photonic applications. A quantum dash mode-locked laser delivering a high power, ultra-stable pulse train is first described. We measured a linewidth below 300 kHz at 4.3 GHz repetition rate, for an output power above 300 mW and a pulse duration of 1.1 ps after compression, making this source ideal for microwave signal sampling applications. A widely tunable (5-110 GHz) monolithic millimeter wave transceiver based on the integration of two semiconductor DFB laser, four amplifiers and two high speed UTC photodiodes is then presented, together with its application to the wireless transmission of data at 200 Mb/s. A frequency agile laser source dedicated to microwave signal processing is then described. It delivers arbitrary frequency sweeps over 20 GHz with a high precision and high speed (above 400 GHz/ms). Finally, we report on a low-noise (below 1 kHz linewidth) solid-state dual-frequency laser source. It allows independent tuning of the two frequencies, in the perspective of the implementation of a tunable optoelectronic oscillator based on a high-Q optical resonator.

Keywords (OCIS):

  • (130.3120) Integrated optics : Integrated optics devices
  • (140.3580) Lasers and laser optics : Lasers, solid-state
  • (140.4050) Lasers and laser optics : Mode-locked lasers
  • (140.5960) Lasers and laser optics : Semiconductor lasers
  • (250.0250) Optoelectronics : Optoelectronics
  • (140.3425) Lasers and laser optics : Laser stabilization

Mid-infrared 2 x 2 electro-optical switching by Si and Ge 3-waveguide and 4-waveguide directional couplers using free carrier injection

  • Richard Soref
  • received 05/05/2014; accepted 06/20/2014; posted 07/01/2014; Doc. ID 211524
  • [full text: PDF (1317) KB)]
  • Abstract: New designs are proposed for 2 x 2 electro-optical switching in the 1.3 to 12 μm wavelength range. Directional couplers are analyzed using a 2D effective-index approximation. It is shown that three or four side-coupled Si or Ge channel waveguides can provide complete cross-bar broad-spectrum switching when the central waveguides are injected with electrons and holes to modify the waveguides’ core index by an amount Δn + i Δk. The 4-waveguide device is found to have a required active length L that is 50% shorter than L for the 3-waveguide switch. A rule of L > 28 for 3w and L >14 for 4w is deduced to promise insertion loss <1.5 dB and crosstalk <-15 dB at the bar state. At an injection of ΔNe= ΔNh= 5 x 1017 cm-3, the predicted L decreased from ~2 mm to ~0.5 mm as λ increased from 1.32 to 12 μm. Because of Ge’s large k, the Ge bar loss is high in 4w but is acceptable in 3w.

Keywords (OCIS):

  • (160.2100) Materials : Electro-optical materials
  • (230.2090) Optical devices : Electro-optical devices
  • (250.5300) Optoelectronics : Photonic integrated circuits
  • (130.4815) Integrated optics : Optical switching devices

Electromagnetic chirality induced by graphene inclusions in multi-layered metamaterials

  • Alessandro Ciattoni, Carlo Rizza, and Elia Palange
  • received 01/27/2014; accepted 06/20/2014; posted 06/25/2014; Doc. ID 205455
  • [full text: PDF (311) KB)]
  • Abstract: We theoretically investigate the electromagnetic response of a novel class of multi-layered metamaterials obtained by alternating graphene sheets and dielectric layers, the whole structure not exhibiting a plane of reflection symmetry along the stacking direction. We show that the electromagnetic response of the structure is characterized by a magneto-electric coupling described by an effective chiral parameter. Exploiting the intrinsic tunability of the graphene-light coupling, we prove that one can tune both the dielectric and the chiral electromagnetic response by varying the graphene chemical potential through external voltage gating.

Keywords (OCIS):

  • (230.4170) Optical devices : Multilayers
  • (160.3918) Materials : Metamaterials
  • (250.5403) Optoelectronics : Plasmonics

(MWP)Terahertz imaging based on optical coherence tomography

  • Tadao Nagatsuma, Hiroki Nishii, and Toshiyuki Ikeo
  • received 03/31/2014; accepted 06/09/2014; posted 06/12/2014; Doc. ID 209321
  • [full text: PDF (779) KB)]
  • Abstract: Three dimensional (3D) terahertz (THz) imaging or THz tomography has recently proven to be useful for non-destructive testing of industrial materials and structures. In place of previous imaging techniques such as THz pulsed/continuous-wave radar and THz computed tomography, we propose a THz optical coherence tomography (OCT) using photonics- and electronics-based THz sources, and demonstrate thickness measurement and 3D imaging in the frequency regions from 400 GHz to 800 GHz.

Keywords (OCIS):

  • (110.0110) Imaging systems : Imaging systems
  • (060.5625) Fiber optics and optical communications : Radio frequency photonics
  • (110.6795) Imaging systems : Terahertz imaging

Articles 1 to 7 of 7





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