Band structure tuning of g-C3N4 via sulfur doping for broadband near-infrared ultrafast photonic applications

Abstract Graphitic carbon nitride (g-C3N4) featuring a stable heptazine ring structure and high polymerization degree, was indexed as a high thermochemical stability material, attracting rising research enthusiasm for diverse applications. However, the poor near-infrared (NIR) optical absorption and resulting limited NIR applications were pronounced for g-C3N4 due to its large bandgap of 2.7 eV. In the present work, sulfur-doping was manifested by first-principles calculations to introduce impurity level and result in anisotropic spin splitting in g-C3N4 for enhancing broadband nonlinear optical characteristics in NIR regime. The modified sulfur-doped g-C3N4 (S-C3N4) exhibited the maximum effective nonlinear absorption coefficient to be −0.82 cm/GW. Pulse duration within hundred nanoseconds was realized with high modulation stability employing S-C3N4 as saturable absorber in Q-switching operations. Moreover, broadband ultrafast photonics properties were successfully demonstrated in constructed ytterbium-doped and erbium-doped fiber lasers, generating highly stable dissipative soliton and traditional soliton mode-locking pulses. The presented S-C3N4 nanomaterial with remarkable nonlinear optical performances might explicitly boost the development and application of g-C3N4 materials in advanced optoelectronic and ultrafast photonic devices.

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2D GeP-based photonic device for near-infrared and mid-infrared ultrafast photonics

Nanophotonics ◽

10.1515/nanoph-2020-0248 ◽

2020 ◽

Vol 9 (11) ◽

pp. 3645-3654

Author(s):

Zhenhong Wang ◽

Jia Guo ◽

Yue Zhang ◽

Jun Liu ◽

Joice Sophia Ponraj ◽

...

Keyword(s):

Fiber Laser ◽

Near Infrared ◽

Ultrashort Pulses ◽

Rogue Waves ◽

Photonic Devices ◽

Strong Light ◽

Mid Infrared ◽

Near Ir ◽

Light Matter Interaction ◽

Ultrafast Photonics

AbstractGermanium phosphide (GeP), a rising star of novel two-dimensional (2D) material composed of Group IV–V elements, has been extensively studied and applied in photonics thanks to its broadband optical absorption, strong light–matter interaction and flexible bandgap structure. Here, we show the strong nonlinear optical (NLO) properties of 2D GeP nanoflakes in the broadband range with open-aperture Z-scan technique to explore the performance of 2D GeP microfiber photonic devices (GMPDs) in near-infrared (near-IR) and mid-infrared (mid-IR) ultrafast photonics. Our results suggest that employing the GMPD as an optical device in an erbium-doped fiber laser (EDFL) system results in ultrashort pulses and rogue waves (RWs) at 1.55 μm. Likewise, by the incorporation of GMPD into a thulium-doped fiber laser (TDFL) system, stable ultrashort pulse operation is also achieved at 2.0 μm. We expect these findings to be an excellent GMPD that can be applied in mode-locked fiber lasers to open up new avenues for its development and application in ultrafast photonics.

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Nonlinear optical properties of anisotropic two-dimensional layered materials for ultrafast photonics

Nanophotonics ◽

10.1515/nanoph-2019-0573 ◽

2020 ◽

Vol 9 (7) ◽

pp. 1651-1673 ◽

Cited By ~ 3

Author(s):

Huanhuan Liu ◽

Zilong Li ◽

Ye Yu ◽

Jincan Lin ◽

Shuaishuai Liu ◽

...

Keyword(s):

Optical Properties ◽

Nonlinear Optical ◽

Optical Switch ◽

Layered Materials ◽

Photonic Devices ◽

Nonlinear Optical Properties ◽

The Novel ◽

Two Dimensional ◽

Ultrafast Photonics ◽

Polarized Raman

AbstractThe discovery of graphene has intrigued the significant interest in exploring and developing the two-dimensional layered materials (2DLMs) for the photonics application in recent years. Unlike the isotropic graphene, a number of 2DLMs possess the in-plane anisotropic crystal structure with low symmetry, enabling a new degree of freedom for achieving the novel polarization-dependent and versatile ultrafast photonic devices. In this review article, we focus on the typical anisotropic 2DLMs including BP, ReS2, ReSe2, SnS, and SnSe and summarize the recent development of these anisotropic 2DLMs in the pulsed laser and the optical switch applications. First, we introduce the fabrication methods as well as the material characterization of the anisotropic 2DLMs by analyzing the polarized Raman configuration. Second, we discuss the anisotropic nonlinear optical properties of the anisotropic 2DLMs and concentrate on the anisotropic nonlinear absorption response. Next, we sum up state of the art of the anisotropic 2DLMs in the application of pulse lasers and optical switches. This review ends with perspectives on the challenge and outlook of the anisotropic 2DLMs for ultrafast photonics applications.

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Enhanced broadband nonlinear optical response of TiO2/CuO nanosheets via oxygen vacancy engineering

Nanophotonics ◽

10.1515/nanoph-2020-0649 ◽

2021 ◽

Vol 10 (5) ◽

pp. 1541-1551

Author(s):

Li Dong ◽

Hongwei Chu ◽

Xiao Wang ◽

Ying Li ◽

Shengzhi Zhao ◽

...

Keyword(s):

Oxygen Vacancy ◽

Nonlinear Optical ◽

Near Infrared ◽

Cupric Oxide ◽

Optical Response ◽

Mode Locking ◽

Step Method ◽

Stable Mode ◽

Ultrafast Optical ◽

Cuo Nanosheets

Abstract Cupric oxide (CuO), as a transition metal oxide (TMO) semiconductor, has attracted tremendous attention for various applications. In the present work, we synthesize the CuO nanosheets modified by TiO2 nanoparticles via a facile, non-toxic two-step method. Subsequently, the morphology and the structures of CuO and TiO2/CuO nanocomposites are investigated. By utilizing the common Z-scan technology, broadband nonlinear optical (NLO) properties of the as-prepared CuO nanosheets and TiO2/CuO nanocomposites are demonstrated, elucidating the enhancement on the NLO response via the TiO2 dopant, which is attributed to the more oxygen vacancies and the formed p-n junctions. Furthermore, CuO nanosheets and TiO2/CuO nanocomposites are implemented to the passively Q-switched bulk lasers operating in the near-infrared (NIR) region, generating broadband ultrastable pulses. Ultimately, TiO2/CuO nanocomposites were intergrated in a passive mode-locking bulk laser for the first time, achieving stable mode-locked pulses and verifying its ultrafast optical response potential. Our results illustrate the tremendous prospects of the CuO nanosheets modified by oxygen vacancy engineering as a broadband NLO material in ultrafast photonics field.

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Electromechanically reconfigurable optical nano-kirigami

Nature Communications ◽

10.1038/s41467-021-21565-x ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Shanshan Chen ◽

Zhiguang Liu ◽

Huifeng Du ◽

Chengchun Tang ◽

Chang-Yin Ji ◽

...

Keyword(s):

Near Infrared ◽

Large Range ◽

Three Dimensional ◽

High Contrast ◽

Si Substrate ◽

High Modulation ◽

Gold Nanostructure ◽

Infrared Wavelengths ◽

On Chip ◽

Nano Electromechanical System

AbstractKirigami, with facile and automated fashion of three-dimensional (3D) transformations, offers an unconventional approach for realizing cutting-edge optical nano-electromechanical systems. Here, we demonstrate an on-chip and electromechanically reconfigurable nano-kirigami with optical functionalities. The nano-electromechanical system is built on an Au/SiO2/Si substrate and operated via attractive electrostatic forces between the top gold nanostructure and bottom silicon substrate. Large-range nano-kirigami like 3D deformations are clearly observed and reversibly engineered, with scalable pitch size down to 0.975 μm. Broadband nonresonant and narrowband resonant optical reconfigurations are achieved at visible and near-infrared wavelengths, respectively, with a high modulation contrast up to 494%. On-chip modulation of optical helicity is further demonstrated in submicron nano-kirigami at near-infrared wavelengths. Such small-size and high-contrast reconfigurable optical nano-kirigami provides advanced methodologies and platforms for versatile on-chip manipulation of light at nanoscale.

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High performing flexible optoelectronic devices using thin films of topological insulator

Scientific Reports ◽

10.1038/s41598-020-80738-8 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Animesh Pandey ◽

Reena Yadav ◽

Mandeep Kaur ◽

Preetam Singh ◽

Anurag Gupta ◽

...

Keyword(s):

Thin Films ◽

Optical Properties ◽

Nonlinear Optical ◽

Near Infrared ◽

Optoelectronic Devices ◽

Nonlinear Optical Properties ◽

Metallic Surface ◽

Strong Light ◽

High Performing ◽

Decay Times

AbstractTopological insulators (TIs) possess exciting nonlinear optical properties due to presence of metallic surface states with the Dirac fermions and are predicted as a promising material for broadspectral phodotection ranging from UV (ultraviolet) to deep IR (infrared) or terahertz range. The recent experimental reports demonstrating nonlinear optical properties are mostly carried out on non-flexible substrates and there is a huge demand for the fabrication of high performing flexible optoelectronic devices using new exotic materials due to their potential applications in wearable devices, communications, sensors, imaging etc. Here first time we integrate the thin films of TIs (Bi2Te3) with the flexible PET (polyethylene terephthalate) substrate and report the strong light absorption properties in these devices. Owing to small band gap material, evolving bulk and gapless surface state conduction, we observe high responsivity and detectivity at NIR (near infrared) wavelengths (39 A/W, 6.1 × 108 Jones for 1064 nm and 58 A/W, 6.1 × 108 Jones for 1550 nm). TIs based flexible devices show that photocurrent is linearly dependent on the incident laser power and applied bias voltage. Devices also show very fast response and decay times. Thus we believe that the superior optoelectronic properties reported here pave the way for making TIs based flexible optoelectronic devices.

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Fast speed switching response and high modulation signal processing bandwidth through LiNbO3 electro-optic modulators

Journal of Optical Communications ◽

10.1515/joc-2020-0012 ◽

2020 ◽

Vol 0 (0) ◽

Author(s):

Mahmoud M. A. Eid ◽

Ahmed Nabih Zaki Rashed ◽

Iraj S. Amiri

Keyword(s):

Near Infrared ◽

Infrared Region ◽

Modulation Bandwidth ◽

Fast Speed ◽

Electrooptic Modulators ◽

High Modulation ◽

Data Rates ◽

Electro Optic ◽

Modulation Signal ◽

Speed Response

AbstractThis work outlined the fast speed response and high modulation bandwidth through LiNbO3 electro-optic modulators. The refractive index is analyzed to estimate the switching voltage and modulation bandwidth for these modulators. The modulation voltage and data transmission data rates are analyzed and discussed clearly through LiNbO3 electro-optic modulators. The modulator’s performance efficiency is upgraded with the optimum modulator length of 10 mm and its thickness of 2 mm. The proposed modulators are compared with GaAs electrooptic modulators under various electro-optic modulators dimensions at 1300 nm near-infrared region and room temperature.

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Colloidal semiconductor nanocrystals: synthesis, optical nonlinearity, and related device applications

Journal of Materials Chemistry C ◽

10.1039/d0tc05771a ◽

2021 ◽

Author(s):

Min Li ◽

Cong Wang ◽

Lude Wang ◽

Han Zhang

Keyword(s):

Nonlinear Optical ◽

Rapid Development ◽

Semiconductor Nanocrystals ◽

Optical Nonlinearity ◽

Photonic Devices ◽

Nlo Properties ◽

Novel Materials ◽

Colloidal Semiconductor Nanocrystals ◽

Device Applications ◽

Colloidal Semiconductor

The rapid development of photonic devices requires the exploration of novel materials with superior nonlinear optical (NLO) properties. Colloidal semiconductor nanocrystals (NCs) exhibit size-tunable exciton resonances and excellent NLO properties....

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A series of terpyridine-based zinc(ii) complexes assembled for third-order nonlinear optical responses in the near-infrared region and recognizing lipid membranes

Journal of Materials Chemistry B ◽

10.1039/c7tb01063j ◽

2017 ◽

Vol 5 (31) ◽

pp. 6348-6355 ◽

Cited By ~ 12

Author(s):

Yiwen Tang ◽

Ming Kong ◽

Xiaohe Tian ◽

Jinghang Wang ◽

Qingyuan Xie ◽

...

Keyword(s):

Lipid Membranes ◽

Nonlinear Optical ◽

Near Infrared ◽

Infrared Region ◽

Biological Imaging ◽

Tissue Penetration ◽

Third Order ◽

Two Photon ◽

Optical Responses ◽

Near Infrared Region

Two-photon (TP) microscopy has advantages for biological imaging in that it allows deeper tissue-penetration and excellent resolution compared with one-photon (OP) microscopy.

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