A5025628801- Advanced Fiber Laser Technologies
- Photonic Crystal and Fiber Optics
- Advanced Sensor and Energy Harvesting Materials
- Advanced Fiber Optic Sensors
- Laser-Matter Interactions and Applications
- Graphene research and applications
- Nanomaterials and Printing Technologies
- 2D Materials and Applications
- Advanced Materials and Mechanics
- Additive Manufacturing and 3D Printing Technologies
- MXene and MAX Phase Materials
- Advanced Photocatalysis Techniques
- Optical Network Technologies
- Mechanical and Optical Resonators
- Diamond and Carbon-based Materials Research
- Gas Sensing Nanomaterials and Sensors
- Solar-Powered Water Purification Methods
- Carbon Nanotubes in Composites
- Gold and Silver Nanoparticles Synthesis and Applications
- Advanced Thermoelectric Materials and Devices
- Organic Electronics and Photovoltaics
- Liquid Crystal Research Advancements
- Quantum Dots Synthesis And Properties
- Nanomaterials for catalytic reactions
- ZnO doping and properties
University of Cambridge
2012-2021
Beihang University
2015
Abstract Black phosphorus is a two-dimensional material of great interest, in part because its high carrier mobility and thickness dependent direct bandgap. However, instability under ambient conditions limits deposition options for device fabrication. Here we show black ink that can be reliably inkjet printed, enabling scalable development optoelectronic photonic devices. Our binder-free suppresses coffee ring formation through induced recirculating Marangoni flow, supports excellent...
We fabricate a few-layer molybdenum disulfide (MoS₂) polymer composite saturable absorber by liquid-phase exfoliation, and use this to passively Q-switch an ytterbium-doped fiber laser, tunable from 1030 1070 nm. Self-starting Q-switching generates 2.88 μs pulses at 74 kHz repetition rate, with over 100 nJ pulse energy. propose mechanism, based on edge states within the bandgap, responsible for wideband nonlinear optical absorption exhibited our MoS₂ sample, despite operating photon energies...
Abstract We fabricate a free-standing few-layer molybdenum disulfide (MoS 2 )-polymer composite by liquid phase exfoliation of chemically pristine MoS2 crystals and use this to demonstrate wideband tunable, ultrafast mode-locked fiber laser. Stable, picosecond pulses, tunable from 1,535 nm 1,565 nm, are generated, corresponding photon energies below the MoS material bandgap. These results contribute growing body work studying nonlinear optical properties transition metal dichalcogenides that...
We fabricate a free-standing molybdenum diselenide (MoSe2) saturable absorber by embedding liquid-phase exfoliated few-layer MoSe2 flakes into polymer film. The MoSe2-polymer composite is used to Q-switch fiber lasers based on ytterbium (Yb), erbium (Er) and thulium (Tm) gain fiber, producing trains of microsecond-duration pulses with kilohertz repetition rates at 1060 nm, 1566 nm 1924 respectively. Such operating wavelengths correspond sub-bandgap absorption in MoSe2, which explained the...
Abstract We demonstrate a ytterbium (Yb) and an erbium (Er)-doped fiber laser Q-switched by solution processed, optically uniform, few-layer tungsten disulfide saturable absorber (WS 2 -SA). Nonlinear optical absorption of the WS -SA in sub-bandgap region, attributed to edge-induced states, is characterized 3.1% 4.9% modulation depths with 1.38 3.83 MW/cm saturation intensities at 1030 1558 nm, respectively. By integrating uniform Yb- Er-doped cavities, we obtain self-starting pulses...
Few-layer molybdenum disulfide (MoS2) is emerging as a promising quasi-two-dimensional material for photonics and optoelectronics, further extending the library of suitable layered nanomaterials with exceptional optical properties use in saturable absorber devices that enable short-pulse generation laser systems. In this work, we catalog review nonlinear few-layer MoS2, summarize recent progress processing integration into devices, comment on current status future perspectives MoS2-based...
Abstract Graphene‐based organic nanocomposites have ascended as promising candidates for thermoelectric energy conversion. In order to adopt existing scalable printing methods developing thermostable graphene‐based devices, optimization of both the material ink and properties resulting films are required. Here, inkjet‐printed large‐area flexible graphene thin with outstanding reported. The thermal electronic transport reveal so‐called phonon‐glass electron‐crystal character (i.e., electrical...
Abstract We report on the integration of inkjet-printed graphene with a CMOS micro-electro-mechanical-system (MEMS) microhotplate for humidity sensing. The ink is produced via ultrasonic assisted liquid phase exfoliation in isopropyl alcohol (IPA) using polyvinyl pyrrolidone (PVP) polymer as stabilizer. formulate inks different concentrations, which are then deposited through inkjet printing over predefined interdigitated gold electrodes microhotplate. flakes form percolating network to...
A binary solvent ink exploiting solutal Marangoni flows to suppress the coffee-ring effect for uniform printing of 2D crystals.
We demonstrate a long-term stable, all-fiber, erbium-doped femtosecond laser mode-locked by black phosphorus saturable absorber. The absorber, fabricated scalable and highly controllable inkjet printing technology, exhibits strong nonlinear optical response is stable for operation against intense irradiation, overcoming key drawback of this material. oscillator delivers self-starting, 102 fs pulses centered at 1555 nm with 40 spectral bandwidth. This represents the shortest pulse duration...
We present the characterisation of a hydrogel forming family benzene 1,3,5-tricarboxamide (BTA) aromatic carboxylic acid derivatives. The simple, easy to synthesise compounds presented here exhibit consistent gel formation at low concentrations through use pH trigger.
Abstract Ultrafast lasers with tunable parameters in wavelength and time domains are the choice of light source for various applications such as spectroscopy communication. Here, we report a pulse-duration mode-locked Erbium doped fiber laser single wall carbon nanotube-based saturable absorber. An intra-cavity filter is employed to continuously tune output 34 nm (from 1525 1559 nm) pulse duration from 545 fs 6.1 ps, respectively. Our results provide novel requiring variable or duration.
Abstract The complex nonlinear dynamics of mode-locked fibre lasers, including a broad variety dissipative structures and self-organization effects, have drawn significant research interest. Around the 2 μ m band, conventional saturable absorbers (SAs) possess small modulation depth slow relaxation time and, therefore, are incapable ensuring inter-pulse bound-state soliton generation. We present observation multi-soliton generation in thulium (Tm)-doped laser, using double-wall carbon...
The nonlinear optical response of a single-wall carbon nanotube composite is characterized across 600–2400 nm, revealing new spectral signatures saturable absorption.
A large-area pressure sensor matrix has been fabricated on a plastic sheet for the first time, integrating high-quality organic field-effect transistors and rubbery sensors. This demonstrates feasibility of applying transistor technology to flexible area-sensors, which opens up new applications FETs including artificial skins.
Abstract We use liquid phase exfoliation to produce dispersions of molybdenum disulfide (MoS 2 ) nanoflakes in aqueous surfactant solutions. The chemical structures the bile salt surfactants play a crucial role and stabilization MoS . resultant are heavily enriched single few ( 6) layer flakes with large edge surface area ratio. fabricate free‐standing polymer composite wide‐band saturable absorbers develop mode‐locked Q‐switched fiber lasers, tunable from 1535 1565 1030 1070 nm,...
We discuss the emerging role of solution processing and functional ink formulation in fabrication devices based on two dimensional (2d) materials. By drawing examples from our research, we show that these inks allow 2d materials to be exploited a wide variety applications, including photonics (opto)electronics.
We demonstrate a ytterbium (Yb) and an erbium (Er)-doped fiber laser Q-switched by solution processed, optically uniform, few-layer tungsten disulfide saturable absorber (WS2-SA). Nonlinear optical absorption of the WS2-SA in sub-bandgap region, attributed to edge-induced states, is characterized 3.1% 4.9% modulation depths with 1.38 3.83 MW/cm2 saturation intensities at 1030 1558 nm, respectively. By integrating uniform Yb- Er-doped cavities, we obtain self-starting pulses microsecond...
Flexographic printing is promising for large‐area electronics due to high print‐speed and roll‐to‐roll capability. There have been recent attempts in using graphene as an active pigment inks, most notably slower techniques such inkjet screen printing. However, formulation of graphene‐enhanced inks high‐speed its effect on key metrics never investigated. Herein, nanoplatelets (GPs) are incorporated a conductive flexographic ink without compromising the rheological properties. An industrial...
Solution processing-based fabrication techniques such as liquid phase exfoliation may enable economically feasible utilization of graphene and related nanomaterials in real-world devices the near future. However, measurement thickness thin film structures fabricated by these approaches remains a significant challenge. By using surface plasmon resonance (SPR), simple, accurate, quick deposited for inkjet-printed films is reported here. We show that SPR technique convenient well-suited...