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Alan Cervantes Farrell, Xiao Meng, Dingkun Ren, Hyunseok Kim, Pradeep Senanayake, Nick Y Hsieh, Zixuan Rong, Ting-Yuan Chang, Khalifa Mohammad Azizur-Rahman, Diana L Huffaker
Single photon detection at near-infrared (NIR) wavelengths is critical for light detection and ranging (LiDAR) systems used in imaging technologies such as autonomous vehicle trackers and atmospheric remote sensing. Portable, high-performance LiDAR relies on silicon-based single-photon avalanche diodes (SPADs) due to their extremely low dark count rate (DCR) and afterpulsing probability, but their operation wavelengths are typically limited up to 905 nm. Although InGaAs-InP SPADs offer an alternative platform to extend the operation wavelengths to eye-safe ranges, their high DCR and afterpulsing severely limit their commercial applications...
December 5, 2018: Nano Letters
Rui-Jun Li, Peng Xu, Peng-Yu Wang, Kuang-Chao Fan, Rong-Jun Cheng, Qiang-Xian Huang
To meet the requirement of high precision measurement of coordinate measurement machine system, a compact microprobe has been designed for 3D measurement in this paper. Aiming to reduce the influences of signal coupling during the probing process, the probe has been designed by adopting two elastic mechanisms, in which the horizontal and vertical motions of the probe tip can be separated by differential signals of quadrant photodetectors in each elastic mechanism. A connecting rod has been designed to transfer the displacement of the probe tip in vertical direction from lower to upper elastic mechanisms...
December 2, 2018: Sensors
Miaomiao Yu, Hang Li, He Liu, Fanglu Qin, Feng Gao, Yunxia Hu, Mingjin Dai, Lifeng Wang, Wei Feng, PingAn Hu
The electronic and optoelectronic properties of 2D alloy Ga0.84In0.16Se were investigated for the first time. 2D Ga0.84In0.16Se FETs show p-type conduction behaviors. 2D Ga0.84In0.16Se photodetectors show high photoresponse in the visible light range of 500 nm to 700 nm. The responsivity value is 258 A/W for alloy photodetector (500 nm illumination), and it is 92 times and 20 times higher than those of 2D GaSe and InSe photodetectors, respectively. Moreover, the alloy photodetector exhibits good photoresponse stability and rapid photoresponse time...
December 3, 2018: ACS Applied Materials & Interfaces
Syed Ghazi Sarwat, Nathan Youngblood, Yat-Yin Au, Jan A Mol, C David Wright, Harish Bhaskaran
Phase change materials are increasingly being explored for photonics applications, ranging from high resolution displays to artificial retinas. Surprisingly, our understanding of the underlying mechanism of light-matter interaction in these materials has been limited to photothermal crystallization, because of its relevance in applications such as re-writable optical discs. Here we report a photoconductivity study of nanoscale thin films of phase change materials. We identify strong photoconductive behaviour in phase change materials, which we show to be a complex interplay of three independent mechanisms: photoconductive, photo induced-crystallization and photo-induced-thermoelectric effects...
December 3, 2018: ACS Applied Materials & Interfaces
Lin Peng, Xing Jiang, Si-Min Li
Terahertz electromagnetic (EM) wave components usually have a single function, such as they can only convert the polarization state of an incident wave or absorb the incident energy, which would be a limitation for their applications. To make a breakthrough, a multi-functional device (MFD) is proposed in this paper, and it is capable of switching between absorption mode and polarization conversion mode. The device has a low-profile and simple structure, and it is constructed by graphene-based absorbing metasurface (AM) and gold-based polarization conversion metasurface (PCM)...
November 29, 2018: Nanoscale Research Letters
Enrico Della Gaspera, Joseph Griggs, Taimur Ahmed, Sumeet Walia, Edwin L H Mayes, Arrigo Calzolari, Alessandra Catellani, Joel van Embden
Doping semiconductor nanocrystals is a powerful tool to impart new and beneficial optical and electrical properties to the host nanocrystals. Doping has been used to improve the performances of nanocrystal-based devices in applications as diverse as optics, magnetism, electronics, catalysis and sensing. In this work we present a low temperature colloidal synthesis of zinc sulfide (ZnS) nanocrystals doped with indium. Through optimization of the reaction parameters and the doping level, quantum confined (∼2 nm in size) crystalline colloids with highly tunable optical properties are achieved...
November 29, 2018: Nanoscale
Nasir Ilyas, Dongyang Li, Yuhao Song, Hao Zhong, Yadong Jiang, Wei Li
Infrared photodetectors are gaining remarkable interest due to their widespread civil and military applications. Low-dimensional materials such as quantum dots, nanowires, and two-dimensional nanolayers are extensively employed for detecting ultraviolet to infrared lights. Moreover, in conjunction with plasmonic nanostructures and plasmonic waveguides, they exhibit appealing performance for practical applications, including sub-wavelength photon confinement, high response time, and functionalities. In this review, we have discussed recent advances and challenges in the prospective infrared photodetectors fabricated by low-dimensional nanostructured materials...
November 27, 2018: Sensors
Wenqiang Wu, Xiandi Wang, Xun Han, Zheng Yang, Guoyun Gao, Yufei Zhang, Jufang Hu, Yongwen Tan, Anlian Pan, Caofeng Pan
The quest for novel deformable image sensors with outstanding optoelectronic properties and large-scale integration becomes a great impetus to exploit more advanced flexible photodetector (PD) arrays. Here, 10 × 10 flexible PD arrays with a resolution of 63.5 dpi are demonstrated based on as-prepared perovskite arrays for photosensing and imaging. Large-scale growth controllable CH3 NH3 PbI3- x Clx arrays are synthesized on a poly(ethylene terephthalate) substrate by using a two-step sequential deposition method with the developed Al2 O3 -assisted hydrophilic-hydrophobic surface treatment process...
November 28, 2018: Advanced Materials
Daoyou Guo, Yuanli Su, Haoze Shi, Peigang Li, Nie Zhao, Junhao Ye, Shunli Wang, Aiping Liu, Zhengwei Chen, Chaorong Li, Weihua Tang
Ultraviolet (UV) radiation has a variety of impacts including the health of humans, the production of crops and the lifetime of buildings. Based on the photovoltaic effect, self-powered UV photodetectors can measure and monitor UV radiation without any power consumption. However, the current low photoelectric performance of these detectors has hindered their practical use. In our study, a super-high performance self-powered UV photodetector based on GaN/Sn:Ga2O3 pn junction was generated by depositing a Sn doped n-type Ga2O3 thin film onto a p-type GaN thick film...
November 28, 2018: ACS Nano
Tao Yang, Yapeng Zheng, Zhentao Du, Wenna Liu, Zuobao Yang, Fengmei Gao, Lin Wang, Kuo-Chih Chou, Xinmei Hou, Weiyou Yang
No abstract text is available yet for this article.
November 27, 2018: ACS Nano
Bálint Náfrádi
No abstract text is available yet for this article.
November 27, 2018: ACS Nano
Zehua Jin, Fan Ye, Xiang Zhang, Shuai Jia, Liangliang Dong, Sidong Lei, Robert Vajtai, Jacob T Robinson, Jun Lou, Pulickel M Ajayan
Two-dimensional (2D) van der Waals layered materials possess innate advantages as integrable sensors, due to their thinness, flexibility and sensitivity. They can be seamlessly integrated onto surfaces with different geometries where detection of near-field signal is desired. In this study, we develop a device transfer technique to integrate 2D devices onto an arbitrary smooth surface. Such technique utilizes a sacrificial polymer underlayer and achieves clean and non-destructive full device transfer. For demonstration, we transferred a complete 2D multilayer InSe photodetector device onto a stripped optical fiber...
November 27, 2018: ACS Nano
Yeongjun Lee, Jin Young Oh, Wentao Xu, Onnuri Kim, Taeho Roy Kim, Jiheong Kang, Yeongin Kim, Donghee Son, Jeffery B-H Tok, Moon Jeong Park, Zhenan Bao, Tae-Woo Lee
Emulation of human sensory and motor functions becomes a core technology in bioinspired electronics for next-generation electronic prosthetics and neurologically inspired robotics. An electronic synapse functionalized with an artificial sensory receptor and an artificial motor unit can be a fundamental element of bioinspired soft electronics. Here, we report an organic optoelectronic sensorimotor synapse that uses an organic optoelectronic synapse and a neuromuscular system based on a stretchable organic nanowire synaptic transistor (s-ONWST)...
November 2018: Science Advances
Yuze Lin, Bo Chen, Yanjun Fang, Jingjing Zhao, Chunxiong Bao, Zhenhua Yu, Yehao Deng, Peter N Rudd, Yanfa Yan, Yongbo Yuan, Jinsong Huang
Identifying the origin of intrinsic instability for organic-inorganic halide perovskites (OIHPs) is crucial for their application in electronic devices, including solar cells, photodetectors, radiation detectors, and light-emitting diodes, as their efficiencies or sensitivities have already been demonstrated to be competitive with commercial available devices. Here we show that free charges in OIHPs, whether generated by incident light or by current-injection from electrodes, can reduce their stability, while efficient charge extraction effectively stabilizes the perovskite materials...
November 26, 2018: Nature Communications
Xiong Feng, Jinglan Zou, Wei Xu, Zhihong Zhu, Xiaodong Yuan, Jianfa Zhang, Shiqiao Qin
Engineering light absorption in graphene has been the focus of intensive research in the past few years. In this paper, we show numerically that coherent perfect absorption can be realized in monolayer graphene in the near infrared range by harnessing resonances of dielectric nanostructures. The asymmetry of the structure results in different optical responses for light illuminated from the top side and the substrate side and enables asymmetric interferometric light-light control. The absorbed and scattered light exhibit interesting nonlinear behavior, allowing switching a strong optical signal output with a weak light...
October 29, 2018: Optics Express
Seo Young Lee, Young-Tak Han, Jong-Hoi Kim, Young-Ho Ko, Chun-Ju Youn, Hyun-Do Jung, Joong-Seon Choe, Won Seok Han, Seok-Tae Kim, Yongsoon Baek
We present a cost-effective and bandwidth-enhanced 64-Gbaud micro-intradyne coherent receiver based on hybrid integration of InP waveguide-photodetector (WG-PD) and silica planar lightwave circuit (PLC). InP waveguide-photodetector (WG-PD) arrays are simply chip-to-chip bonded and optically butt-coupled to a silica-based dual-polarization optical hybrid chip. Multiple flexible printed circuit boards are adapted for electrical RF and DC wirings, which provide low-cost integration and good RF performance of the receiver...
October 29, 2018: Optics Express
Ye Zhang, Dejia Meng, Xiao Li, Honghao Yu, Jianjun Lai, Zhaoyang Fan, Changhong Chen
Here, we present a graphene-based long-wavelength infrared photodetector, for enhancing the infrared absorption of which the design consists of magnetic- and electric-plasmon resonators of metasurface to excite the graphene surface-plasmonic polaritons (SPPs). Through tuning the graphene Fermi energy to achieve the distinct resonances in a matching frequency, peak graphene absorbance exceeding 67.2% is confirmed, even when a lossy dielectric is used, and the field angle of view is up to 90°. If the graphene is of a different carrier mobility, then the absorption frequency is lockable, and the device always can keep the system absorbance close to 100 percent...
November 12, 2018: Optics Express
Jian Kang, Shinichi Takagi, Mitsuru Takenaka
We present a proof-of-concept demonstration of a Ge/a-Si hybrid photonic integrated circuit platform utilizing a high-quality Ge-on-insulator (GeOI) wafer fabricated by wafer bonding technology. Amorphous Si (a-Si) formed by PECVD is found to be a promising alternative to conventional Si passive waveguides on a SiO2 BOX. Taking advantage of the high crystal quality of the Ge active layer and the easy fabrication of an a-Si waveguide, a low-dark-current Ge waveguide PIN photodetector monolithically integrated with an a-Si passive waveguide is successfully demonstrated on a GeOI wafer...
November 12, 2018: Optics Express
J Davila-Rodriguez, X Xie, J Zang, C J Long, T M Fortier, H Leopardi, T Nakamura, J C Campbell, S A Diddams, F Quinlan
Analog photonic links require high-fidelity, high-speed optical-to-electrical conversion for applications such as radio-over-fiber, synchronization at kilometer-scale facilities, and low-noise electronic signal generation. Photodetector nonlinearity is a particularly vexing problem, causing signal distortion and excess noise, especially in systems utilizing ultrashort optical pulses. Here we show that photodetectors designed for high power handling and high linearity can perform optical-to-electrical conversion of ultrashort optical pulses with unprecedented linearity over a large photocurrent range...
November 12, 2018: Optics Express
B I Shapiro, A D Nekrasov, V S Krivobok, V S Lebedev
We report results of experimental studies of the photoabsorption, photoluminescent and photoelectric properties of a new type of multilayer molecular nanocrystals, consisting of highly ordered J-aggregates of one anionic and two cationic J-aggregates of cyanine dyes. In contrast to conventional J-aggregated dyes the multichromic nanocrystals synthesized in this work, are capable of efficient light absorption in three excitonic bands of the visible and near-IR spectral ranges. The spectral peak positions in the absorption bands can be controlled by appropriately selecting a set of dyes a molecular crystal is made of...
November 12, 2018: Optics Express
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