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Photonics Research

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Articles 1 to 19 of 19


Direct detection of transient super-resolution effect of nonlinear saturation absorption thin films

  • J. S Wei and Xinghao Zhang
  • received 03/03/2015; accepted 03/16/2015; posted 03/25/2015; Doc. ID 235443
  • [full text: PDF (712) KB)]
  • Abstract: Using strong nonlinear saturation absorption effect to break through the diffraction limit is an alternative technique. In this technique, formation of a dynamic and reversible optical pinhole channel and tranient super-resolution is critical. In this work, a pump-probe transient detection and observation-experimental setup is constructed to explore the formation process directly. Ge2Sb2Te5 thin film with strong nonlinear saturation absorption is investigated. The dynamic evolution of the optical pinhole channel is detected and imaged, and the transient super-resolution spot is directly captured experimentally. Results verify that the super-resolution effect originates from generation of an optical pinhole channel and that the formation of the optical pinhole channel is dynamic and reversible. A good method is provided for direct detection and observation of the transient process of the super-resolution effect of nonlinear thin films.

Keywords (OCIS):

  • (190.4360) Nonlinear optics : Nonlinear optics, devices
  • (210.0210) Optical data storage : Optical data storage

(PBTD) Nonlinear optical absorption of few-layer molybdenum diselenide (MoSe2) for passively mode-locked soliton fiber laser

  • Zhengqian Luo, Yingyue Li, Min Zhong, Yizhong Huang, Xiaojiao Wan, Jian Peng, and Jian Weng
  • received 01/06/2015; accepted 03/12/2015; posted 03/13/2015; Doc. ID 231765
  • [full text: PDF (4166) KB)]
  • Abstract: In this paper, both nonlinear saturable absorption (SA) and two-photon absorption (TPA) of few-layer MoSe2 were observed at 1.56 μm wavelength, and further applied to mode-locked ultrafast fiber laser for the first time. Few-layer MoSe2 nanosheets were prepared by liquid-phase exfoliation method, and characterized by X-ray diffractometer, Raman spectroscopy and atomic force microscopy. The obtained few-layer MoSe2 dispersion is further composited with a polymer material for conveniently fabricating MoSe2 thin films. Then, we investigate the nonlinear optical absorption property of the few-layer MoSe2 film using the balanced twin-detector measurement technique. Both the SA and TPA effects of the few-layer MoSe2 film were found as increasing the input optical intensity. The SA shows an modulation depth of 0.63% and a low non-saturable loss of ~3.5%, corresponding to the relative modulation depth of 18%. The TPA effect occurred when the input optical intensity exceeds to ~260 MW/cm2. Furthermore, we experimentally exploit the SA of few-layer MoSe2 film to mode lock an all-fiber erbium-doped fiber laser. Stable soliton mode-locking at 1558 nm center wavelength is achieved with the pulse duration of 1.45 ps. It was also observed that the TPA process suppresses the mode-locking operation in the case of higher optical intensity. Our results indicate that the layered MoSe2 as another two-dimensional nanomaterial can also provide excellent nonlinear optical properties (e.g. SA and TPA) for potential applications in ultrashort pulse generation and optical limiting.

Keywords (OCIS):

  • (160.4330) Materials : Nonlinear optical materials
  • (140.3538) Lasers and laser optics : Lasers, pulsed
  • (160.4236) Materials : Nanomaterials
  • (060.3510) Fiber optics and optical communications : Lasers, fiber

Flexible, Robust and Highly Efficient Broadband Nonlinear Optical Devices Based on Graphene Oxide Impregnated Polymer sheets

  • Xiaofang Jiang, Lakshminarayana Polavarapu, RiZhao Ma, and Qing-Hua Xu
  • received 01/08/2015; accepted 03/11/2015; posted 03/13/2015; Doc. ID 232097
  • [full text: PDF (1916) KB)]
  • Abstract: A facile method was used to fabricate low-cost, flexible optical limiting devices based on graphene oxide impregnated polyvinyl alcohol sheets. These composite sheets displayed highly efficient broadband optical limiting activities for femtosecond laser pulses at 400 and 800 nm with very low limiting thresholds. Femtosecond pump-probe measurement results revealed that nonlinear absorption is responsible for the observed optical limiting activities. High flexibility and efficient optical limiting activities of these materials allow these composite sheets to be attached to non-planar optical sensors to protect them from light-induced damage.

Keywords (OCIS):

  • (160.4330) Materials : Nonlinear optical materials
  • (300.6500) Spectroscopy : Spectroscopy, time-resolved
  • (310.6860) Thin films : Thin films, optical properties
  • (320.7110) Ultrafast optics : Ultrafast nonlinear optics

1.3kW monolithic linearly-polarized single-mode MOPA and strategies for mitigating mode instabilities

  • Rumao Tao, Pengfei Ma, Xiaolin Wang, Pu Zhou, and Zejin Liu
  • received 01/12/2015; accepted 03/09/2015; posted 03/13/2015; Doc. ID 232432
  • [full text: PDF (534) KB)]
  • Abstract: We report on the high power amplification of 1064nm linearly-polarized laser in all-fiber polarization-maintained MOPA, which can operate at output power level of 1.3kW. The beam quality (M2) was measured to be <1.2 at full power operation. The polarization extinction rate of the fiber amplifier was measured to be above 94% before mode instabilities (MI) sets in, which reduced to about 90% after the onset of MI. Power scaling capability of strategies for suppressing MI is analyzed based on a semi-analytical model, the theoretical results of which agree with the experimental results. It shows that mitigating MI by coiling the gain fiber is an effective and practical way in standard double-cladding large mode area fiber, and, by tight coiling of the gain fiber to the radius of 5.5cm, the MI threshold can be increased to 3 times higher than that without coiling or loose coiling. Experimental study has been carried out to verify the idea, which has proved that MI was suppressed successfully in the amplifier by proper coiling.

Keywords (OCIS):

  • (060.2420) Fiber optics and optical communications : Fibers, polarization-maintaining
  • (060.2430) Fiber optics and optical communications : Fibers, single-mode
  • (140.3510) Lasers and laser optics : Lasers, fiber

Growth of large area atomically thin MoS2 film via ambient pressure chemical vapour deposition

  • Qiaoliang Bao, Caiyun Chen, Hong Qiao, Jingchao Song, Shaojuan Li, Yao Lu, Wenzhi Yu, and Yunzhou Xue
  • received 01/12/2015; accepted 03/08/2015; posted 03/11/2015; Doc. ID 232329
  • [full text: PDF (2207) KB)]
  • Abstract: Atomically thin MoS2 films have attracted significant attention due to excellent electrical and optical properties. The development of device applications demands the production of large area thin film which is still an obstacle. Here we developed a facile method to directly grow large area MoS2 thin film on SiO2 substrate via ambient pressure chemical vapor deposition method. The characterizations by spectroscopy and electron microscopy reveal that the as-grown MoS2 film is mainly bilayer and trilayer with high quality. Back gate field-effect transistor based on such MoS2 thin film shows carrier mobility up to 3.4 cm2 V-1 s-1 and on/off ratio of 105. The large area atomically thin MoS2 prepared in this study has the potential for wide optoelectronic and photonic device applications.

Keywords (OCIS):

  • (250.0250) Optoelectronics : Optoelectronics
  • (310.3840) Thin films : Materials and process characterization
  • (310.6860) Thin films : Thin films, optical properties
  • (180.5655) Microscopy : Raman microscopy
  • (310.6188) Thin films : Spectral properties
  • (310.6845) Thin films : Thin film devices and applications

(PBTD) The CVD-grown few-layer MoS2 as a broadband Q-switcher for erbium-doped fiber lasers

  • HE-PING LI, Handing Xia, Changyong Lan, Chun Li, Jinbo Du, Shang Jian Zhang, and Yong Liu
  • received 01/06/2015; accepted 03/05/2015; posted 03/06/2015; Doc. ID 231615
  • [full text: PDF (489) KB)]
  • Abstract: We report an erbium-doped fiber laser (EDFL) passively Q-switched by a few-layer molybdenum disulfide (MoS2) saturable absorber (SA). The few-layer MoS2 is grown by the chemical vapor deposition (CVD) method and transferred onto the end face of a fiber connector to form a fiber-compatible MoS2 SA. The laser cavity is constructed by using a three-port optical circulator and a fiber Bragg grating (FBG) as the two end mirrors. Stable Q-switched pulses are obtained with a pulse duration of 1.92 μs at 1560.5 nm. By increasing the pump power from 42 to 204 mW, the pulse repetition rate can be widely changed from 28.6 to 114.8 kHz. Passive Q-switching operations with discrete lasing wavelengths ranging from 1529.8 to 1570.1 nm are also investigated by using FBGs with different central wavelengths. This study demonstrates that few-layer MoS2 can serve as a promising broadband SA for Q-switching laser operation.

Keywords (OCIS):

  • (140.3500) Lasers and laser optics : Lasers, erbium
  • (140.3540) Lasers and laser optics : Lasers, Q-switched
  • (190.4400) Nonlinear optics : Nonlinear optics, materials

(PBTD)Ethanol catalytic deposition of MoS₂ on tapered fiber

  • hao wang, Xiaoyan Zhang, sheng liu, Bangqi Zhu, Bohua Chen, Jun Wang, Kan Wu, and Jianping Chen
  • received 01/06/2015; accepted 03/04/2015; posted 03/06/2015; Doc. ID 231621
  • [full text: PDF (995) KB)]
  • Abstract: Deposition of two-dimensional (2D) MoS₂ materials on the tapered fiber allows various photonic applications including saturable absorber and four-wave mixing. Ethanol catalytic deposition (ECD) of MoS₂ on the optical tapered fiber was proposed and demonstrated in this work. Different from the conventional optical driven deposition using water or organic solvent, ECD method utilized the high volatility of the ethanol solvent which significantly increased the movement speed of the MoS₂ nanosheets and thus boosted the deposition rate and reduced the minimum power threshold to drive the deposition. We believe ECD method should be able to be applied to other similar 2D materials such as other types of transition metal chalcogenides.

Keywords (OCIS):

  • (160.4330) Materials : Nonlinear optical materials
  • (190.4360) Nonlinear optics : Nonlinear optics, devices
  • (310.1860) Thin films : Deposition and fabrication

(PBTD)Passively Q-switched tri-wavelength Yb3+:GdAl3(BO3)4 solid-state laser with topological insulator Bi2Te3 as saturable absorber

  • yijian sun, Chao-Kuei Lee, Chaoyang Tu, Jinglong Xu, Ye Wang, Houping Xia, Zhaojie Zhu, you zhenyu, and Shufang Gao
  • received 01/06/2015; accepted 03/04/2015; posted 03/06/2015; Doc. ID 231768
  • [full text: PDF (862) KB)]
  • Abstract: In this paper, we reported a multi-wavelength passively Q-switched Yb3+:GdAl3(BO3)4 solid state laser with topological insulator Bi2Te3 as saturable absorber for the first time. Bi2Te3 nanosheets were prepared by the facile solvothermal method. The influence of three Bi2Te3 densities on the laser operation was compared. The maximum average output power was up to 57mW with a pulse energy of 511.7nJ. The shortest pulse width was measured to be 370 ns with110 kHz pulse repetition rate and 40 mW average power. The laser operated at three wavelengths simultaneously at 1043.7, 1045.3, and 1046.2 nm, of which the frequency differences were within terahertz wave band. Our work suggests that that solvothermal synthesized Bi2Te3 is a promising saturable absorber for simultaneously multi-wavelength laser operation.

Keywords (OCIS):

  • (140.3480) Lasers and laser optics : Lasers, diode-pumped
  • (140.3540) Lasers and laser optics : Lasers, Q-switched
  • (140.3580) Lasers and laser optics : Lasers, solid-state
  • (140.3615) Lasers and laser optics : Lasers, ytterbium

Dual-wavelength rectangular pulse Erbium-doped fiber laser based on topological insulator saturable absorber

  • BO GUO, Yong Yao, Yanfu Yang, yijun yuan, Bo Yan, Lei Jin, and Jian-Yu Zhang
  • received 01/06/2015; accepted 03/01/2015; posted 03/02/2015; Doc. ID 231779
  • [full text: PDF (1051) KB)]
  • Abstract: We reported on the generation of the dual-wavelength rectangular pulses in an Erbium-doped fiber laser (EDFL) with a topological insulator saturable absorber. The rectangular pulse could be stably initiated with pulse width from 13.62 ns to 25.16 ns and fundamental repetition rate of 3.54 MHz by properly adjusting the pump power and the polarization state. In addition, we verified that the pulse shape of the rectangular pulses can be affected by the total net cavity dispersion in the fiber laser. Furthermore, by properly rotating the polarization controllers, the harmonic mode-locking (HML) operation of the rectangular pulse was also obtained. The dual-wavelength rectangular pulses from an EDFL would open some potential applications for fields such as spectroscopy, biomedicine and sensing research.

Keywords (OCIS):

  • (140.3500) Lasers and laser optics : Lasers, erbium
  • (140.3510) Lasers and laser optics : Lasers, fiber
  • (140.4050) Lasers and laser optics : Mode-locked lasers
  • (190.4370) Nonlinear optics : Nonlinear optics, fibers
  • (230.2285) Optical devices : Fiber devices and optical amplifiers
  • (160.4236) Materials : Nanomaterials


Interference of Quantum Beats in Hong-Ou-Mandel Interferometry

  • Jing Qiu, Yong-Sheng Zhang, Jun-Heng Shi, Shensheng Han, and You-Zhen Gui
  • received 12/24/2014; accepted 02/24/2015; posted 02/27/2015; Doc. ID 231297
  • [full text: PDF (485) KB)]
  • Abstract: Quantum beats can be produced in the fourth-order interference such as in Hong-Ou-Mandel (HOM) interferometer by using photons with different frequencies. Here we present theoretically the appearance of interference of quantum beats when the HOM interferometer is combined with a Franson-type interferometer. This interesting phenomenon can help us get a better understanding of the bi-photon amplitude superposition nature of bi-photon and we expect that it may provide a new way in quantum metrology.

Keywords (OCIS):

  • (270.1670) Quantum optics : Coherent optical effects
  • (270.5290) Quantum optics : Photon statistics
  • (270.5570) Quantum optics : Quantum detectors

(PBTD)Soliton Mode-Locked Fiber Laser Based on Topological Insulator Bi2Te3 Nanosheets at 2 μm

  • Ke Yin, Bin Zhang, Jing Hou, Lei Li, Xuanfeng Zhou, and Tian Jiang
  • received 01/06/2015; accepted 02/23/2015; posted 02/24/2015; Doc. ID 231613
  • [full text: PDF (564) KB)]
  • Abstract: We reported diverse soliton operations in a thulium /holmium-doped fiber laser by taking advantages of a tapered fiber based topological insulator (TI) Bi2Te3 saturable absorber. The saturable absorber had a non-saturable loss is ~53.5 % and a modulation depth of 9.8 %. Stable fundamental mode-locked solitons at 1909.5 nm with distinct Kelly sidebands on the output spectrum, a pulse repetition rate of 21.5 MHz and a measured pulse width of 1.26 ps were observed in the experiments. By increasing the pump power, both bunched solitons with soliton number up to 15 and harmonically mode-locked solitons with harmonic order up to 10 were obtained. To our knowledge, this is the first report of both bunched solitons and harmonically mode-locked solitons in a fiber laser at 2 μm region incorporated with the topological insulators.

Keywords (OCIS):

  • (060.5530) Fiber optics and optical communications : Pulse propagation and temporal solitons
  • (140.0140) Lasers and laser optics : Lasers and laser optics
  • (140.4050) Lasers and laser optics : Mode-locked lasers
  • (140.7090) Lasers and laser optics : Ultrafast lasers
  • (160.4330) Materials : Nonlinear optical materials

Conversion of out-of-phase to in-phase order in coupled laser arrays with second harmonics

  • Chene Tradonsky, Vishwa Pal, Nir Davidson, Asher Friesem, Micha Nixon, Eitan Ronen, and Ronen Chriki
  • received 01/12/2015; accepted 02/22/2015; posted 02/24/2015; Doc. ID 232228
  • [full text: PDF (2476) KB)]
  • Abstract: A novel method for converting an array of out-of-phase lasers into one of in-phase lasers that can be tightly focused is presented. The method exploits second harmonic generation and can be adapted for different laser arrays geometries. Experimental and calculated results, presented for negatively coupled lasers formed in a square, honeycomb, and triangular geometries are in good agreement.

Keywords (OCIS):

  • (140.3290) Lasers and laser optics : Laser arrays
  • (140.3460) Lasers and laser optics : Lasers
  • (140.3580) Lasers and laser optics : Lasers, solid-state
  • (190.0190) Nonlinear optics : Nonlinear optics
  • (140.3325) Lasers and laser optics : Laser coupling
  • (140.3515) Lasers and laser optics : Lasers, frequency doubled

Ultra-thin, planar, broadband, dual-polarity plasmonic metalens

  • Zhongyi Guo, Wei Wang, Rongzhen Li, Jingran Zhang, Yi Liu, Xinshun Wang, and Shiliang Qu
  • received 01/06/2015; accepted 02/17/2015; posted 02/18/2015; Doc. ID 234647
  • [full text: PDF (4230) KB)]
  • Abstract: An ultra-thin, planer, broadband metalens composed of metal rectangular split-ring resonators (MRSRR) have been designed, which shows dual-polarity characteristics for the different type of circularly polarized (CP) light incidence. The designed metalens can be considered as the focusing lens and diverging lens under the LCP and RCP light incidence, respectively. The phase discontinuity of the cross-polarized transmission light is produced by the optical-axis rotation through modulating two arms’ lengths of the MRSRR. The MRSRR metalens posses a wavelength-controllable focal length and a relative larger chromatic aberration (CA) compared with the conventional lenses. And the focal length change from 9 to 7 μm with incident wavelength from 740 to 950 nm. The dual-polarity flat metalens opens a door for new applications of phase discontinuity devices, and it will promote the fabricating capability of the on-chip or fiber-embedded optical devices.

Keywords (OCIS):

  • (080.3630) Geometric optics : Lenses
  • (120.5060) Instrumentation, measurement, and metrology : Phase modulation
  • (160.3918) Materials : Metamaterials

High-Q ring resonators directly written in As2S3 chalcogenide glass films

  • Avi Zadok, Levy Shahar, and Matvey Klebanov
  • received 01/20/2015; accepted 02/16/2015; posted 02/18/2015; Doc. ID 232805
  • [full text: PDF (1107) KB)]
  • Abstract: Planar ring resonator waveguides are fabricated in thin films of As2S3 chalcogenide glass, deposited on silica-on-silicon substrates. Waveguide cores are directly written by scanning the focused illumination of a femto-second Ti:Sapphire laser at a central wavelength of 810 nm, through a two-photon photo-darkening process. A large photo-induced index change of 0.3-0.4 refractive index units is obtained. The radius of the ring resonator is 1.9 mm, corresponding to a transmission free spectral range of 9.1 GHz. A high loaded (intrinsic) Q value of 110,000 (180,000) is achieved. The thermal dependence of the resonator transfer function is characterized. The results provide the first report of directly-written high-Q ring resonators in chalcogenide glass films, and demonstrate the potential of this simple technique towards fabrication of planar light-guide circuits in these materials.

Keywords (OCIS):

  • (230.5750) Optical devices : Resonators
  • (130.2755) Integrated optics : Glass waveguides
  • (160.5335) Materials : Photosensitive materials

(PBTD) Few-layer MoS2-deposited microfiber as highly-nonlinear photonic device for pulse shaping in a fiber laser

  • Zhi-Chao Luo, Aiping Luo, Meng Liu, Xu-De Wang, Qiuyi Ning, and Wen-Cheng Xu
  • received 01/06/2015; accepted 02/15/2015; posted 02/17/2015; Doc. ID 231632
  • [full text: PDF (1440) KB)]
  • Abstract: Two-dimensional (2D) materials have emerged as attractive mediums for fabricating versatile optoelectronic devices. Recently, few-layer Molybdenum Disulfide (MoS2), as a shining 2D material, has been discovered to possess both the saturable absorption effect and large nonlinear refractive index. Herein, by virtue of the unique nonlinear optical properties of MoS2, we fabricated a highly-nonlinear saturable absorption photonic device by depositing the few-layer MoS2 onto the microfiber. With the proposed MoS2 photonic device, apart from conventional soliton patterns, the mode-locked pulses could be shaped into some new soliton patterns, i.e., multiple soliton molecules, localized chaotic multi-pulse and double-scale soliton clusters. Our findings indicate that the few-layer MoS2-deposited microfiber could operate as a promising highly-nonlinear photonic device for the related nonlinear optics applications.

Keywords (OCIS):

  • (060.5530) Fiber optics and optical communications : Pulse propagation and temporal solitons
  • (140.3510) Lasers and laser optics : Lasers, fiber
  • (140.4050) Lasers and laser optics : Mode-locked lasers
  • (160.4330) Materials : Nonlinear optical materials

Silicon high-speed BPSK modulator with a single-drive push-pull high speed travelling wave electrode

  • Jinting Wang, Linjie Zhou, haike zhu, Rui Yang, Yanyang Zhou, Lei Liu, Tao Wang, and Jianping Chen
  • received 11/28/2014; accepted 02/12/2015; posted 02/13/2015; Doc. ID 228707
  • [full text: PDF (2660) KB)]
  • Abstract: We demonstrate binary phase shift keying (BPSK) modulation using a silicon Mach-Zehnder modulator with a π-phase-shift voltage (Vπ) of -4.5 V. The single-drive push-pull travelling wave electrode has been optimized using numerical simulations with a 3 dB electro-optic bandwidth of 35 GHz. 32 Gbps BPSK constellation diagram is measured with an error vector magnitude of 18.9%.

Keywords (OCIS):

  • (130.0250) Integrated optics : Optoelectronics
  • (130.3120) Integrated optics : Integrated optics devices
  • (130.4110) Integrated optics : Modulators


A tunable near-infrared plasmonic perfect absorber based on phase-change materials

  • Minghui Hong, Yiguo Chen, xiong li, Xiangang Luo, and Stefan Maier
  • received 12/18/2014; accepted 01/26/2015; posted 01/28/2015; Doc. ID 230906
  • [full text: PDF (1262) KB)]
  • Abstract: A tunable plasmonic perfect absorber with a tuning range of ~650 nm is realized by introducing a 20 nm-thick phase-change material Ge₂Sb₂Te₅ (GST) layer into the metal-dielectric-metal configuration. The absorption at the plasmonic resonance is kept above 0.96 across the whole tuning range. Here we study this extraordinary optical response numerically and reveal the geometric conditions which support this phenomenon. This work shows a promising route to achieve tunable plasmonic devices for multi-band optical modulation, communication and thermal imaging.

Keywords (OCIS):

  • (310.4165) Thin films : Multilayer design
  • (250.5403) Optoelectronics : Plasmonics
  • (310.6188) Thin films : Spectral properties
  • (310.6628) Thin films : Subwavelength structures, nanostructures


SIMO Detection Schemes for Underwater Optical Wireless Communication under Turbulence

  • Zhengyuan Xu, Weihao Liu, and Liuqing Yang
  • received 10/21/2014; accepted 12/14/2014; posted 01/27/2015; Doc. ID 225438
  • [full text: PDF (545) KB)]
  • Abstract: In underwater optical wireless communication (UOWC), channel is characterized by the abundant scattering/absorption effects and optical turbulence. Most studies on the UOWC are limited to the scattering/absorption effects. However experimental studies in the literature indicate that the underwater optical turbulence can cause severe communication quality degradation. In this paper, the UOWC channel with both scattering/absorption and turbulence taken into consideration is characterized, and a spatial diversity receiver scheme, say a SIMO scheme, based on a LED source and multiple detectors is proposed to mitigate the deep fading. The Monte-Carlo based statistical simulation method is introduced to evaluate the bit-error-rate (BER) performance of the system. It is shown that spatial diversity can reduce channel fading effectively and extend communication range remarkably.

Keywords (OCIS):

  • (060.0060) Fiber optics and optical communications : Fiber optics and optical communications
  • (010.4455) Atmospheric and oceanic optics : Oceanic propagation

Introduction to the Photonics based on Two-dimensional materials feature issue

  • Han Zhang, Zhipei SUN, and Jun Wang
  • received 03/20/2015; accepted ; posted 03/20/2015; Doc. ID 236660
  • [full text: PDF (204) KB)]
  • Abstract: Enlightened by the unique optical and electronic properties of graphene, two-dimensional (2D) materials have been extensively studied in recent years driven by their promising applications for novel photonics devices, ranging from photo-detectors, saturable absorbers to optical modulators. The emergence of 2D materials might not only change our insights on nano-scale materials, but also provides unprecedented opportunities for researchers to investigate the photonics based on 2D materials. In comparison with the conventional three-dimensional (3D) photonic materials, 2D materials have many interesting properties. 1) Given that 2D materials are atomically thin, most of them have strong interaction with light. For instance, single layer of molybdenum disulfide (MoS2) absorbs around 10% at excitonic resonances. Owing to their diverse electronic properties, such materials can extend over a wide range of electromagnetic spectrum. 2) Depending on their thickness and concrete material compositions, 2D materials show versatile band-gap properties from wide-band insulator, narrow-band semiconductor to semi-metal or metal, rendering them as attractive candidates for broadband photonics devices. 3) The 2D quantum confinement effect makes their optoelectronic properties (band-gap, absorption, etc.) sensitively dependent on the structure details (defects, doping, etc.) or external perturbations (mechanical strain, electric field, etc.). These grant the convenient and effective control of their optoelectronic response, leading to some new conceptual photonics devices, such as 2D materials-based optical modulators, optomechanical sensors and bio-optical sensors. 4) Atomically thin 2D heterostructures can be readily assembled by stacking different types of 2D materials, offering a flexible and easy approach to engineer the desired properties of photonic devices. 5) The surfaces of 2D materials are naturally passivated without any dangling bonds, making their integration simple with different photonic devices such as waveguides and cavities. It is therefore envisaged that 2D materials and their heterostructures--combined with other available approaches to control the light–matter interaction--offer a great opportunity to the optics community in designing new functional photonics devices across a wide range of the electromagnetic spectrum. Photonics based on 2D materials, as a continuously advancing research area, is a field that investigates the light-matter interaction in 2D materials and the related applications of 2D materials for light generation, detection, propagation and modulation. The intention of this feature issue is to introduce the fundamental and applied research progress in the optics and photonics of 2D materials. This feature issue presents sixteen papers, including five invited papers produced by internationally recognized research teams. Papers in the feature issue cover a wide range of the recent advances in photonics based on 2D materials, including the internal carrier dynamics, saturable absorber, single-longitude-mode generation, ultra-short pulse generation, and nonlinear refractive index tunability by using different kinds of 2D materials, ranging from graphene, topological insulator to transition metal dichalcogenides (i.e., MoS2, WS2, MoSe2). We would like to thank Zhiping Zhou, Editor-in-Chief of Photonics Research, for the opportunity to publish the feature issue; Jie Ding and Keith Jackson for their great support during the entire process of preparing this special issue. We also appreciate the great efforts from all of the reviewers who gave detailed review/suggestions to the manuscripts. Finally, we are very grateful to all the authors for their contributions to this feature issue. We believe that the papers in the feature issue will provide readers with better knowledge about the recent developments in photonics based on 2D materials.

Keywords (OCIS):

  • (000.0000) General : General
  • (000.1570) General : Chemistry
  • (000.1780) General : Conferences, lectures, and institutes

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