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- 2018
- imgae sensor
- internet of things
- drone
- visible light ID
- Signal-to-Noise Ratio (SNR)
- Infinite Gain Multiple Feedback (IGMF)
- Visible Light Communications (VLC)
- LED
- Trans-Impedance Amplifier (TIA)
- Optoelectronic Information Science and Engineering
- Tohoku University
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Silicon nitride photonic integration for visible light applications
摘要： In this article, we provide a review of fabrication platforms and state of the art developments in the area of silicon nitride photonic integrated circuits (PICs) for the visible wavelength range, mostly employed in biomedical and chemical sensing applications. Additionally, we introduce PIX4life, the European pilot line for silicon nitride PICs for visible applications. PIX4life provides a unified framework for the development of such PICs, including design and software, fabrication, characterization and packaging.
关键词： Visible light,Silicon nitride,Photonics,Biophotonics,Microscopy,Sensing
更新于2025-09-23 15:21:21
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Improving the Visible-Light Photocatalytic Activity of Graphitic Carbon Nitride by Carbon Black Doping
摘要： Hydrogen production by water splitting and the removal of aqueous dyes by using a catalyst and solar energy are an ideal future energy source and useful for environmental protection. Graphitic carbon nitride can be used as the photocatalyst with visible light irradiation. However, it typically suffers from the high recombination of carriers and low electrical conductivity. Here, we have developed a facile mix-thermal strategy to prepare carbon black-modified graphitic carbon nitrides, which possess high electrical conductivity, a wide adsorption range of visible light, and a low recombination rate of carriers. With the help of carbon black, highly crystallized graphitic carbon nitrides with built-in triazine and heptazine heterojunctions are obtained. Improved photocatalytic activities have been achieved in carbon black-modified graphitic carbon nitride. The dye removal rate can be three times faster than that of pristine graphitic carbon nitride and the photocatalytic H2 generation is 234 μmol h?1 g?1 under visible light irradiation.
关键词： aqueous dyes removal,hydrogen production,carbon black doping,graphitic carbon nitride,visible-light photocatalytic activity
更新于2025-09-23 15:21:21
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Surface-Initiated Metal-Free Photoinduced ATRP of 4-Vinylpyridine from SiO2 via Visible Light Photocatalyst for Self-healing Hydrogels
摘要： Robust and self-healable nanocomposite hydrogels was realized by the encapsulation of components of photoinduced electron transfer-atom transfer radical polymerization (PET-ATRP) into the surface-modified silica nanoparticles (SiO2). The prepared SiO2@P4VP was in the form of self-healing nanocomposite hydrogels, where 4-Vinylpyridine (4VP) was polymerized through PET-ATRP with organic photocatalyst Rhodamine B. The modified nanoparticles were characterized by X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), transmission electron microscopy (TEM), and Fourier transform infrared spectroscopy (FT-IR). The nanocomposite hydrogels can be healed rapidly and autonomously without any stimulation at ambient temperature. Specifically, the nanocomposite hydrogels has a tensile strength of about 2.90 MPa, which recovered to 77.0% after 12 hours, and an elongation at break of about 730 %. These self-healing hydrogels with cheap raw material, possess better strength and self-healing performance, will have broad prospects.
关键词： Self-Healing Hydrogels,Visible Light,Metal-Free Photoinduced ATRP,Nanocomposite Hydrogels
更新于2025-09-23 15:21:21
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The synthesis of graphene-TiO2/g-C3N4 super-thin heterojunctions with enhanced visible-light photocatalytic activities
摘要： In this paper, an efficient strategy for the synthesis of graphene nanobelt-titanium dioxide/graphitic carbon nitride (graphene-TiO2/g-C3N4) heterostructure photocatalyst was applied to fabricate a kind of visible-light-driven photocatalyst. The heterostructure shows higher absorption edge towards harvesting more solar energy compared with pure TiO2 and pure g-C3N4 respectively. Furthermore, the as-prepared graphene-TiO2/g-C3N4 heterostructure can show enhanced photocatalytic activity under visible-light irradiation. These outstanding performances of photocatalytic activities for graphene-TiO2/g-C3N4 composites can be attributed to the heterojunction interfaces which can separate the electron-hole pairs and impede the recombination of electrons and holes more efficiently. This study conclusively demonstrates a facile and environmentally friendly new strategy to design highly efficient graphene-TiO2/g-C3N4 heterostructure photocatalytic materials for potential applications under visible-light irradiation.
关键词： Visible light,Heterojunction,Nanostructured catalysts,Graphene,Photocatalytic activity
更新于2025-09-23 15:21:21
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Visible Laser on Silicon Optofluidic Microcavity
摘要： Optical readout within microfluidic chips is a bottleneck limiting their industrial development. The integration of lasers operating in the visible range within a microfluidic platform is crucial for enabling in situ optical measurements in lab-on-a-chip applications. In principle, microstructured single-crystal silicon is an excellent optofluidic platform, which allows integration of microfluidic channels together with optical circuits including micro-optics, waveguides, and resonant cavities. However, the silicon absorption below 1.1 μm is a fundamental limit that prohibits the use of silicon-based micro-cavities as the feedback element for visible lasers and restricts their use to the infrared only. In this work, an ultra-wide band silicon cavity enabled by two deeply etched hollow-core planar waveguides is demonstrated. The proposed microcavity shows a broad bandwidth extending from 500 to 1600 nm with quality factors up to 2067. A tubular microfluidic channel is inserted between the mirrors of the optofluidic cavity. The microfluidic channel is filled with Rhodamine 6G (R6G) at 20 μL min?1 flow rate allowing successful demonstration of lasing on silicon at 562.4 nm. The laser beam propagates in-plane (along the chip surface) and is handled with monolithically integrated input/output optical fiber grooves. This provides a unique silicon platform integrating hollow core optofluidic channels together with optical cavities, which is suitable for implementing optical readout in lab-on-a-chip devices.
关键词： visible lasers,microcavities,silicon,optofluidics,lab on a chip
更新于2025-09-23 15:21:01
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Photoelectrochemical-assisted batch injection analysis (PEC-BIA) of glucose exploiting visible LED light as an excitation source
摘要： This work describes the development of a novel method for glucose determination exploiting a photoelectrochemical-assisted batch injection analysis cell designed and constructed with the aid of 3D printer technology. The PEC-BIA cell was coupled to a LED lamp in order to control the incidence of light on the Cu2O/Ni(OH)2/FTO photoelectroactive platform. The electrochemical characteristics of Cu2O/Ni(OH)2/FTO photoelectroactive platform were evaluated by cyclic voltammetry, amperometry, and electrochemical impedance spectroscopy. The PEC-BIA cell presented linear response range, limit of detection based on a signal-to-noise ratio of three, and sensitivity of 1 – 1000 μmol L-1, 0.76 μmol L-1 and 0.578 μA L μmol-1, respectively. The PEC-BIA method presented a mean value of the recovery values of 97.0 % to 102.0 % when it was applied to glucose determination in artificial blood plasma samples which indicates the promising performance of the proposed system to determine glucose.
关键词： Photoelectrochemistry,Visible LED light,Glucose,Batch injection analysis,3D-Printing,Cu2O/Ni(OH)2
更新于2025-09-23 15:21:01
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Full-visible-spectrum lighting enabled by an excellent cyan-emitting garnet phosphor
摘要： The development of phosphor materials with outstanding photoluminescence properties is critical for next-generation high-quality solid-state white lighting. As there is a blue-green cavity existed in the emission spectra of the traditional phosphor-converted white-light-emitting diodes (w-LEDs), cyan-emitting phosphor serves an important function in compensating the spectral gap to realize the “full-visible-spectrum lighting”. Herein, we reported the discovery of an efficient cyan-emitting Ce3+-doped Ca2YHf2Al3O12 (CYHAO) garnet phosphor with good thermal stability. The as-prepared CYHAO:Ce3+ phosphor exhibited a broad excitation band in the range of 360 to 460 nm with a maximum at 408 nm, making this phosphor compatible with an efficient 400 nm NUV-emitting LED chip. Under the 408 nm excitation, the optimal sample of CYHAO:0.03Ce3+ exhibited bright broadband cyan emission (λem = 493 nm; bandwidth = 100 nm) together with extra-high internal quantum efficiency (IQE) of 89.5% and external quantum efficiency (EQE) of 69.1%. Notably, the as-prepared CYHAO:0.03Ce3+ phosphor showed good thermal stability (64.2% of emission intensity retained at 423K) and excellent color stability when working in the temperature range of 303-463 K. Importantly, the constructed w-LED device exhibited bright well-distributed warm white light with high color rendering index (CRI; Ra = 93.5 and R12 = 90.4) and low correlated color temperature (3700 K) under 60 mA driven current, indicating that the title cyan phosphor can be utilized as the compensation of the blue-green cavity to apply in full-visible-spectrum lighting. Furthermore, these findings provide new insights into exploring high-performance cyan phosphors for NUV-pumped high-CRI warm w-LEDs.
关键词： White LEDs,Color rendering index,Cyan emissions,Phosphors,Full-visible-spectrum lighting
更新于2025-09-23 15:21:01
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[IEEE 2020 International Conference on Information Science and Communication Technology (ICISCT) - KARACHI, Pakistan (2020.2.8-2020.2.9)] 2020 International Conference on Information Science and Communication Technology (ICISCT) - Futuristic Short Range Optical Communication: A Survey
摘要： The demand for high-speed data communication and seamless user connectivity is increasing day by day which lead towards the development of new next generation communication services. Wi-Fi, the most popular wireless networking technology uses radio waves as medium for transmission. However, it has a constraint over security, reliability, speed and range of transmission. Li-Fi addresses these issues by providing a high-speed communication which is tremendously faster than Wi-Fi. Furthermore, it is also considered an ideal candidate for secure communication. In this paper, we present a survey on Li-Fi technique and different architectures which have been proposed over the past for achieving high speed communication using visible light. In addition to this, this paper also discusses the key challenges which are being faced nowadays in achieving optimal visible light communication.
关键词： High Data Rate,Wi-Fi,Li-Fi,Visible Light Communication
更新于2025-09-23 15:21:01
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[IEEE 2020 International Conference on COMmunication Systems & NETworkS (COMSNETS) - Bengaluru, India (2020.1.7-2020.1.11)] 2020 International Conference on COMmunication Systems & NETworkS (COMSNETS) - Demonstration of High Data-rate Multimedia Streaming in a Laser-based Indoor Visible Light Communication System
摘要： We report the demonstration of real-time high-quality multimedia data streaming over a laser-based indoor visible light communication (VLC) link consisting of blue laser diode excited remote phosphor as transmitter, an amplified ac-coupled silicon photodetector as the receiver and USRP platforms for data modulation/ demodulation. The VLC link has been separately characterized and supports bandwidth > 800 MHz. Streaming of 1280 x 720 HD video is successfully demonstrated over this VLC link with an ethernet link data rate of 200Mbps and RF carrier frequency at the radio front-end at 245 MHz. When compared to previous multimedia streaming demonstrations in LED based VLC links, the high link data rates, and RF carrier frequency as reported here are achievable due to the large inherent bandwidth supported by laser sources. The potential applications of this demonstration are in next-generation heterogeneous wireless networks in which Wi-Fi and VLC links link as co-exist. The high-bandwidth optical wireless link demonstrated here is suitable for low-latency, data-intensive, dedicated communication, for example in robotic telepresence, tactile tasks, etc.
关键词： Multimedia Streaming,Laser Diode,Visible Light Communication,USRP
更新于2025-09-23 15:21:01
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Ultra-long high quality catalyst-free WO<sub>3</sub> nanowires for fabricating high-performance visible photodetectors
摘要： This work presents a study on the controlled growth of WO3 nanowires via chemical vapor deposition without catalyst, and their potential applications in visible photodetectors. The influence of growth conditions on the morphology of WO3 nanowires is studied in order to understand the growth mechanism of WO3 nanowires, and ultra-long (60 μm, the longest one ever reported) WO3 nanowires with a spindle shape are achieved by optimizing the growth conditions. The photoconductor detectors based on WO3 single nanowires present excellent device performance with a responsivity as high as 19 A/W at a bias of 0.1 V, a detectivity as high as 1.06 × 1011 Jones, and a response (rising and decay) time as short as 8 ms under the illumination of a 404 nm laser. These results indicate the great potential of WO3 nanowires for applications in fabricating high performance visible photodetectors.
关键词： visible light,high performance,photodetectors,chemical vapor deposition,WO3 nanowires
更新于2025-09-23 15:21:01