Article
Optics
Kuo-Chih Lee, Yu-Hsien Chuang, Chen-Kai Huang, Hui Li, Guo-En Chang, Kuan-Ming Hung, Hung Hsiang Cheng
Summary: Graphene-on-silicon photodetectors with a thin oxide layer exhibit p-type characteristics and have high responsivities, surpassing those of pure graphene or Si detectors. The p-type carrier concentration dominates the photocurrent, and photocurrent tunability is achieved through back-gated biasing. Gate amplification produces a current equal to the photogating current at a low bias, and photocurrent attenuation enables adjustments in detector output. This study establishes a model for gate-dependent currents and highlights the potential of gate-tunable photodetectors in high-performance optoelectronics.
Article
Nanoscience & Nanotechnology
Gollakota Venkata Sai Manohar, Debanjan Das, Karuna Kar Nanda
Summary: A visible-blind infrared photodetector was successfully realized by embedding IrP2 nanoparticles into few-layer graphene through solid-state pyrolysis, showing high responsivity and response speed. The device exhibited sensitivity to long-wavelength infrared radiation but remained unresponsive to visible light, making it a promising candidate for wearable sensor applications.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
Ching-Han Mao, Abhishek Dubey, Fang-Jing Lee, Chun-Yen Chen, Shin-Yi Tang, Ashok Ranjan, Ming-Yen Lu, Yu-Lun Chueh, Shangjr Gwo, Ta-Jen Yen
Summary: This study proposes an approach to enhance 2D MoS2 photosensing by combining plasmonic nanostructures and physical suspension, resulting in a hybrid structure with high responsivity and large active area. The gateless responsivity of the hybrid structure reaches 402.4 A/W at a wavelength of 532 nm, representing the highest value reported for gateless plasmonic MoS2 photodetectors. The exceptional detectivity of 2.34 x 10(12) Jones highlights the potential of this approach for designing high-performance 2D TMDC-based optoelectronic devices.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Physics, Applied
Pengju Tan, Yanni Zou, Xiaolong Zhao, Xiaohu Hou, Zhongfang Zhang, Mengfan Ding, Shunjie Yu, Xiaolan Ma, Guangwei Xu, Qin Hu, Shibing Long
Summary: This work demonstrates the potential of metal-semiconductor field-effect phototransistors based on exfoliated Ga2O3 microflake and graphene thin film for highly tunable solar-blind photodetectors. By regulating the gate voltage, the photocurrent generation mechanism in the device can be continuously tuned, resulting in excellent performance and stability.
APPLIED PHYSICS LETTERS
(2022)
Article
Nanoscience & Nanotechnology
Yifei Wang, Vinh X. Ho, Prashant Pradhan, Michael P. Cooney, Nguyen Q. Vinh
Summary: A method has been developed to achieve high-performance photodetectors based on graphene with high responsivity and fast response time by growing an absorber layer directly on graphene. These photodetectors exhibit high responsivity and fast response time, providing promising applications under low incident intensity.
ACS APPLIED NANO MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Teresa Crisci, Piera Maccagnani, Luigi Moretti, Caterina Summonte, Mariano Gioffre, Rita Rizzoli, Maurizio Casalino
Summary: In this work, a vertically illuminated near-infrared photodetector based on graphene layer embedded between crystalline and hydrogenated silicon layers is investigated. The devices show an unexpected increase in thermionic current under near-infrared illumination, attributed to the lowering of the graphene/crystalline silicon Schottky barrier caused by an upward shift in graphene Fermi level induced by charge carriers released from traps at the graphene/amorphous silicon interface. A complex model is presented to reproduce and discuss the experimental observations. The responsivity of the devices reaches a maximum value of 27 mA/W at 1543 nm under an optical power of 8.7 mu W, indicating the potential for developing near-infrared silicon photodetectors for power monitoring applications.
Article
Nanoscience & Nanotechnology
Vinh X. Ho, Yifei Wang, Leslie Howe, Michael P. Cooney, Nguyen Q. Vinh
Summary: The practical realization of optoelectronic devices operating in the mid-infrared region is hindered by barriers such as cryogenic operation and complicated growth processes, prompting the interest in extending the performance of graphene photodetectors into this region. By utilizing photoionization of shallow impurities and over band gap excitation in highly doped Si:B and Si:P substrates, researchers have achieved pure graphene photodetectors operating in a broadband range from deep ultraviolet to mid-infrared, with a photoresponsivity of about 5 A/W under mid-infrared illumination at room temperature. This paves the way for a concept of dual-photogating effect induced by both highly doped Si substrates and nanomaterials/nanostructures on top of graphene field-effect transistors.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Kean You Thai, InJun Park, Beom Jin Kim, Anh Tuan Hoang, Yoondeok Na, Chul Un Park, Youngcheol Chae, Jong-Hyun Ahn
Summary: MoS2, a promising material in optoelectronics, has high light absorption efficiency but is currently limited to the visible spectrum. Strain engineering can modulate the bandgap to extend its application coverage to the infrared range. This study demonstrates a strained MoS2-based photodetector array that can capture vis-NIR images, showcasing its potential in real-life imaging systems.
Article
Chemistry, Multidisciplinary
Yiming Ma, Yuhua Chang, Bowei Dong, Jingxuan Wei, Weixin Liu, Chengkuo Lee
Summary: Mid-infrared absorption spectroscopy is important for molecule identification and quantification, and integrated photonics technology allows on-chip spectroscopic sensing to minimize device size, cost, and power consumption. The integration of waveguides and photodetectors is essential for on-chip sensing systems, and extending the operating wavelengths to long-wave infrared range faces challenges from both waveguide platforms and photodetection technologies.
Article
Nanoscience & Nanotechnology
Jun Yang, Linlong Tang, Wei Luo, Shuanglong Feng, Chongqian Leng, Haofei Shi, Xingzhan Wei
Summary: The introduction of a DLC interlayer in Si/DLC/GNWs heterojunctions significantly improves interfacial adhesion and performance of optoelectronic devices, enhancing manufacturing compatibility for photodetectors, and potentially serving as a universal strategy for high-performance hybrid interfaces in next-generation optoelectronic devices.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Instruments & Instrumentation
Andreas Bablich, Maurice Mueller, Rainer Bornemann, Andreas Nachtigal, Peter Haring Bolivar
Summary: In this study, massive nonlinearities in amorphous silicon p-i-n photodiodes enabled by photogating are presented, resulting in responsivities up to 744 mA/W at blue wavelengths. The detectors exhibit significant responsivity gains at optical modulation frequencies exceeding MHz and a more than 60-fold enhanced spectral response compared to the non-gated state. Electro-optical simulations verify photocarrier modulation due to defect-induced field screening to be the origin of such high responsivity gains. The experimental results validate the theory and enable the development of commercially viable and CMOS compatible high responsivity photodetectors operating in the visible range for low-light level imaging and detection.
Review
Nanoscience & Nanotechnology
Hongyu Tang, Sergey G. Menabde, Tarique Anwar, Junhyung Kim, Min Seok Jang, Giulia Tagliabue
Summary: In this review, different strategies for photo-modulation of electrical and optical properties of graphene are surveyed, including photogating, generation of hot carriers, and thermo-optical effects. The role of nanophotonic strategies in maximizing these effects is briefly discussed, and promising fields for application of these techniques are highlighted.
Article
Chemistry, Physical
Navaneeth K. Krishnan, Anjusree Sreedharan, Srikrishna Sagar, Litty Thomas Manamel, Arka Mukherjee, Bikas C. Das
Summary: In this study, a self-powered broadband photodetector utilizing a lateral heterojunction between MoS2 and CuPc was demonstrated. The interfacial built-in potential and modulation of optoelectronic properties led to superior UV-Vis-NIR broadband photoresponse. Additionally, the device showed a faster response speed and self-powered operation, making it advantageous compared to conventional photogating-based devices.
APPLIED SURFACE SCIENCE
(2021)
Article
Nanoscience & Nanotechnology
Hao Jiang, Anqi Fan, Hongchun Yang, Jiuxun Sun, Yang Li, Haijuan Cui
Summary: This article proposes a method to enhance the photogain of graphene/silicon photodetectors by manipulating the interface coupling. The mechanism behind this enhancement is analyzed through carrier transport and potential distribution. Additionally, a double-gate enhancement method based on the graphene/silicon-on-insulator structure is suggested to further improve the responsivity of the photodetector.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Tae Jin Yoo, Wan Sik Kim, Kyoung Eun Chang, Cihyun Kim, Min Gyu Kwon, Ji Young Jo, Byoung Hun Lee
Summary: A graphene photodetector decorated with Bi2Te3 nanowires demonstrated high gain and wide bandwidth window. The photoconductive gain was significantly improved compared to a graphene/Bi2Te3 nanoplate junction, and the position of photocurrent generation was investigated. By utilizing low bandgap Bi2Te3 nanowires and a graphene junction, the photoresponsivity was increased effectively.
Editorial Material
Optics
Lei Jin, Cheng-Wei Qiu
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Chemistry, Physical
Yang Chen, Jiangang Feng, Yuqing Huang, Weijin Chen, Rui Su, Sanjib Ghosh, Yi Hou, Qihua Xiong, Cheng-Wei Qiu
Summary: This study demonstrates the realization of compact spin-valley-locked perovskite emitting metasurfaces with pure circular polarization, high directionality, and large emission angles by imparting spin-dependent geometric phases through Brillouin zone folding.
Article
Nanoscience & Nanotechnology
Hongtao Wang, Hao Wang, Qifeng Ruan, John You En Chan, Wang Zhang, Hailong Liu, Soroosh Daqiqeh Rezaei, Jonathan Trisno, Cheng-Wei Qiu, Min Gu, Joel K. W. Yang
Summary: By miniaturizing spiral phase plates and integrating them with structural colour filters, we have successfully generated coloured orbital angular momentum beams using incoherent white light. These beams, which possess both spatial and temporal coherence, can independently generate multiple helical eigenstates and combine colour information into orbital angular momentum beams.
NATURE NANOTECHNOLOGY
(2023)
Article
Optics
Tao Zhao, Peiyao Xie, Hujie Wan, Tianpeng Ding, Mengqi Liu, Jinlin Xie, Enen Li, Xuequan Chen, Tianwu Wang, Qing Zhang, Yanyu Wei, Yubin Gong, Qiye Wen, Min Hu, Cheng-Wei Qiu, Xu Xiao
Summary: This study demonstrates the potential of MXene materials to achieve the intrinsic thin-film absorption limit across the entire 0.5-10 THz band, which is crucial for high-performance terahertz detectors in various fields such as wireless communications, astronomy, security screening, and medical imaging.
Article
Optics
Haoye Qin, Zengping Su, Mengqi Liu, Yixuan Zeng, Man-Chung Tang, Mengyao Li, Yuzhi Shi, Wei Huang, Cheng-Wei Qiu, Qinghua Song
Summary: Breaking the symmetry of photonic crystal slabs (PhCSs) can realize upward and downward asymmetry and arbitrarily polarized bound states in the continuum (BIC) by using a bilayer-twisted PhCS. This structure exhibits elliptical polarization states with constant ellipticity angle within the vicinity of BIC. The topological nature of BIC is reflected in the orientation angle of polarization state, with a topological charge of 1 for any value of ellipticity angle. Full coverage of Poincare sphere and higher-order Poincare sphere can be achieved by tailoring the twist angles. These findings may have applications in structured light, quantum optics, and twistronics for photons.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Optics
He-Xiu Xu, Guangwei Hu, Xianghong Kong, Yanzhang Shao, Patrice Genevet, Cheng-Wei Qiu
Summary: Electromagnetic wave multiplexing, especially for spatial-frequency multiplexing, is important for ultrathin multifunctional interfaces and high-capacity information processing and communication. However, it is challenging to achieve with passive and compact wave elements due to the exclusive coupling between wave excitation and scattering channels. In this study, a spin-momentum multiplexed paradigm called a super-reflector is proposed, enabling control of both retroreflections and anomalous reflections. By multiplexing four channels connecting two spin states and three spatial frequencies, a total of twelve channels are engineered, with five degrees of freedom in circular polarization Jones' matrix. Experimental verification has been conducted, showcasing twelve reflected beams with high efficiency exceeding 90.6%. This strategy opens up possibilities for angle multiplexing and angle-resolved metadevices.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Editorial Material
Optics
Jiazheng Qin, Mengjia Wang, Cheng-Wei Qiu
Summary: By controlling graphene, it has become easier to access and track exceptional points.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Optics
Jin Chen, Feilong Yu, Xingsi Liu, Yanjun Bao, Rongsheng Chen, Zengyue Zhao, Jiuxu Wang, Xiuxia Wang, Wen Liu, Yuzhi Shi, Cheng-Wei Qiu, Xiaoshuang Chen, Wei Lu, Guanhai Li
Summary: A full-polarization metasurface is developed to overcome the polarization constraint in mid-infrared wavelengths, allowing for independent selection of orthogonal polarization at each wavelength. Experimental results show that the metasurface exhibits a detection sensitivity one order of magnitude higher than existing infrared detectors.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Plant Sciences
Yi Wu, Fangbin Cao, Lupeng Xie, Feibo Wu, Shenlong Zhu, Chengwei Qiu
Summary: Aluminum toxicity is a major constraint to crop production in acidic soils. This study investigated the changes in miRNA expression in the roots of two olive genotypes with contrasting aluminum tolerance. A total of 352 miRNAs were discovered, and 11 miRNAs showed significantly different expression patterns between the tolerant and sensitive genotypes under aluminum stress. In silico prediction identified potential target genes involved in transcriptional regulation, hormone signaling, transportation, and metabolism. These findings provide new insights into the regulatory roles of miRNAs in enhancing aluminum tolerance in olives.
Article
Chemistry, Physical
Jinni Shen, Xu Liu, Yuhua Zhong, Chengwei Qiu, Huihui Xu, Hongsheng He, Haifeng Li, Jianhan Lin, Zizhong Zhang, Xuxu Wang
Summary: Solar light-driven overall water splitting for hydrogen production is an ideal solution to climate warming and energy shortage issues. Obtaining a highly efficient and stable photocatalyst remains a major challenge at present. Herein, NixP/gamma-Ga2O3 nanosheets are found to be a highly active and durable photocatalyst for pure water splitting into H2 and O2 without a sacrificial reagent.
ACS APPLIED ENERGY MATERIALS
(2023)
Editorial Material
Multidisciplinary Sciences
Yucheng Jiang, Yangliu Wu, Jinlei Zhang, Jingxuan Wei, Bo Peng, Cheng-Wei Qiu
Article
Materials Science, Multidisciplinary
Mengqi Liu, Weijin Chen, Guangwei Hu, Shanhui Fan, Demetrios N. Christodoulides, Changying Zhao, Cheng-Wei Qiu
Summary: Perfect absorbers that can completely absorb all incoming energy have been extensively studied and found to be associated with topological spectral phase singularities (SPS). The order of the topological invariant depends on the number of degenerate outgoing channels. By examining mirror-backed and all-dielectric structures, the generation, evolution, and annihilation of SPSs with different orders are revealed. A strategy based on charge conservation of SPSs has been established to design dual-band perfect absorbers. These findings highlight the topological origin of perfect absorption and its potential applications in biosensing, topological metasurfaces, and micro/nano thermal radiation.
Article
Engineering, Multidisciplinary
Lin Bai, Yuan Ke Liu, Liang Xu, Zheng Zhang, Qiang Wang, Wei Xiang Jiang, Cheng-Wei Qiu, Tie Jun Cui
Summary: This work proposes and realizes a smart metasurface that utilizes human speech recognition for programming electromagnetic manipulations. The smart metasurface platform consists of a digital coding metasurface, a speech-recognition module, a single-chip computer, and a digital-to-analog converter circuit, and can intelligently control EM waves based on pre-stored voice commands. The constructed digital metasurface is composed of 6x6 super unit cells, each consisting of 4x4 active elements with embedded varactor diodes. The speech-recognition module, together with the DAC and single-chip computer, can recognize voice commands and generate corresponding voltage sequences to control the metasurface.
Article
Engineering, Environmental
Cheng-Wei Qiu, Yue Ma, Zi-Feng Gao, Jakkrit Sreesaeng, Shuo Zhang, Wenxing Liu, Imrul Mosaddek Ahmed, Shengguan Cai, Yizhou Wang, Guoping Zhang, Feibo Wu
Summary: This study provides a comprehensive examination of genetic variation in aluminum-tolerant Tibetan wild barley through genome-wide profiling. The identification of key genes related to aluminum tolerance in barley and the strategy of manipulating these genes offer potential for developing more aluminum-tolerant barley cultivars.
JOURNAL OF HAZARDOUS MATERIALS
(2024)