NeoPhotonics Corporation is an American public corporation based in San Jose, California. It was founded in 1996. The company develops, manufactures and sells optoelectronic products that transmit, receive and switch high speed digital optical signals for communications networks, These products include transceivers, tunable lasers, high bandwidth receivers, optical semiconductors, photonic integrated circuits, and 100 gigabit per second and above modules." These are each "cost-effective components that handle massive amounts of data at very high speeds".NeoPhotonics products primarily implement coherent technology and include those designed for 100G and beyond data rates, such as at 200G, 400G and 600G, for telecom and datacenter or content provider networks and applications. The company's high speed 100G and beyond coherent products are based on Advanced Hybrid Photonic Integration technology.Applications in coherent transmission use not only amplitude but also phase and polarization to increase data rates tenfold or more over conventional “on-off” transmission protocols. Coherent transmission is also necessary for next-generation flexible and efficient switching of signals individual wavelength without conflict or contention between wavelengths in an optical network, such as Software Defined Networks. Coherent transmission has become the technology of choice for the most advanced high speed telecommunications networks today.Revenues from the company's high speed products have grown rapidly due to the rapid expansion of telecom backbone and content provider networks accommodating increased mobile traffic. Initial adoption of the company's 100G coherent products were in the Long Haul market sector, over the next several years it is expect that growth in 100G and beyond will be mainly driven by adoption of 100G coherent products in the much larger Metro market sector and the datacenter market for large web-scale data network market.NeoPhotonics Corporation is listed on the New York Stock Exchange under the ticker symbol NPTN.
Ultrasensitive photodetectors with high responsivity, rapid response speed, and low dark current are in urgent demand for a wide range of applications. The coupling between plasmonic metals and heterojunctions can enhance light absorption capabilities and facilitate hot electrons injection. However, recent research on plasmonic heterojunction devices has primarily focused on enhancing the local electromagnetic field, while the practical use of hot electrons remains limited. This is due to the formation of defects when metal nanoparticles (NPs) are integrated onto the surface of heterojunctions. Energetic hot electrons and photogenerated carriers are trapped by defect states, resulting in prolonged carrier lifetimes. The excited-state carriers cannot be effectively utilized, which reduces the photoelectric conversion efficiency of the devices. In this study, we propose a Cu@CuO core-shell plasmonic structure designed for ultrasensitive photodetection. The presence of the CuO layer effectively reduces defects and establishes a Type-II band alignment for the device, thereby enhancing hot electrons injection efficiency and charge transfer. The MoS2/Cu@CuO photodetector exhibits a high responsivity (633 A/W) without sacrificing the response speed (28 ns). The core-shell architecture of metal NPs provides a viable strategy for further development of ultrasensitive photodetectors utilizing hot electrons injection.
The CO2 reduction reaction (CO2RR) to produce C-2 products relies on the synergy between the C-1 generation site and the C-C coupling site within the photocatalytic system. However, yields are often limited by inadequate C-1 precursor production, inefficient multielectron transport, and weak C-1 adsorption at the C-C coupling site. In this study, we developed a highly efficient photocatalytic system that achieved remarkable conversion of CO2 to C2H6 by integrating Pd single atomic sites and island-distributed PdO nanoparticles onto phosphorus-modified BiOCl (PdO/BOCP-Pd-1). This system exhibited a prominent C2H6 yield of 215.6 mu mol g(-1) h(-1) and a selectivity of 97.5%, maintaining its performance with negligible decay over a minimum duration of 200 h, representing the top-level photocatalytic performance of reported photocatalysts. Both experimental and theoretical results confirm that the Pd-1 site in the PdO/BOCP-Pd-1 catalyst significantly enhances the availability of local CO. Its distinctive S-scheme charge transfer mode promotes the formation of electron-rich PdO sites. Thanks to the superior CO adsorption capacity of PdO, these electron-rich PdO sites can serve as efficient C-C coupling sites after adsorbing CO, ultimately leading to the highly efficient production of C2H6. This study provides insight into designing multisite cooperative photocatalysts for superior CO2RR to C-2 products.
Strategic morphology engineering of metal-organic frameworks (MOFs) confers on them intriguing functionalities and expanded applications. Herein, we constructed a series of luminescent MOF composites (MOF@CNCs), through in situ growing of aggregation-induced-emission luminogen (AIEgen)-based MOFs onto cellulose nanocrystals (CNCs). By adjustment of the CNC contents, the morphology of MOF@CNCs can be precisely regulated, evolving from needle-like to rod-like and ultimately to flake-like structures resembling floral nanoclusters. Notably, MOF@CNCs performed a pronounced fluorescence enhancement response to lactic acid (LA), a significant biomarker. Particularly, MOF@CNC-1 exhibited superior sensitivity, surpassing other MOF@CNCs with a linear detection range of 0-70 mM for LA, which fully covered the physiological concentration of 2-20 mmol/L during the transition from rest to intense physical activity. Taking advantage of the distinctive sensitivity of the MOF@CNC-1 suspension, we developed fluorescent test strips for assessing LA level quantitatively. This work introduced a strategy to design MOF composites, leveraging CNC templating to enhance the photoluminescence sensing performance for biomarkers.
Diffractive devices are essential components in the reduction of the volume of optical systems. The graphene oxide (GO) lens, well-known for its nanoscale thickness, high numerical aperture, one-step laser fabrication, and low fabrication cost, offers a significant advantage in the field of integration with fibers and photonics chips. However, existing research indicates that the diffraction efficiency of GO lenses integrated with fibers and photonics chips is quite low (around 10%). The low diffraction efficiency causes several issues for applications based on GO lenses, including energy dispersion, low signal-to-noise ratio, and low image brightness. In this study, we present the design and fabrication of a femtosecond laser direct writing (FLDW) fiber GO lens with a thickness of 400 nm, which has a diffraction efficiency of 34.7% (more than three times that of former research). Furthermore, the fiber GO lens exhibits a high numerical aperture (NA) of 0.55, rendering it a promising option for a diverse range of applications in optical communications, medical optics, and imaging systems.
