Journal ArticleDOI
Photoresponse of an Electrically Tunable Ambipolar Graphene Infrared Thermocouple
Patrick Herring,Allen Hsu,Nathaniel M. Gabor,Yongcheol Shin,Jing Kong,Tomas Palacios,Pablo Jarillo-Herrero +6 more
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TLDR
It is determined that the optical absorption and thermal conduction of the substrate play the dominant role in the measured photoresponse of the measured graphene thermal detectors.Abstract:
We explore the photoresponse of an ambipolar graphene infrared thermocouple at photon energies close to or below monolayer graphene’s optical phonon energy and electrostatically accessible Fermi energy levels. The ambipolar graphene infrared thermocouple consists of monolayer graphene supported by an infrared absorbing material, controlled by two independent electrostatic gates embedded below the absorber. Using a scanning infrared laser microscope, we characterize these devices as a function of carrier type and carrier density difference controlled at the junction between the two electrostatic gates. On the basis of these measurements, conducted at both mid- and near-infrared wavelengths, the primary detection mechanism can be modeled as a thermoelectric response. By studying the effect of different infrared absorbers, we determine that the optical absorption and thermal conduction of the substrate play the dominant role in the measured photoresponse of our devices. These experiments indicate a path towa...read more
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Journal ArticleDOI
Direct optical detection of Weyl fermion chirality in a topological semimetal
Qiong Ma,Su-Yang Xu,Ching-Kit Chan,Ching-Kit Chan,Chenglong Zhang,Guoqing Chang,Yuxuan Lin,Weiwei Xie,Tomas Palacios,Hsin Lin,Shuang Jia,Patrick A. Lee,Pablo Jarillo-Herrero,Nuh Gedik +13 more
TL;DR: Measuring the photocurrent response to circularly polarized mid-infrared light provides direct access to the chirality of Weyl fermions in Weyl semimetals.
Journal ArticleDOI
Tunable Electrical and Optical Characteristics in Monolayer Graphene and Few-Layer MoS2 Heterostructure Devices
Servin Rathi,Inyeal Lee,Dongsuk Lim,Jianwei Wang,Yuichi Ochiai,Nobuyuki Aoki,Kenji Watanabe,Takashi Taniguchi,Gwan Hyoung Lee,Young-Jun Yu,Philip Kim,Gil-Ho Kim +11 more
TL;DR: Graphene-MoS2 heterostructure exhibits a strongest optical response for 520 nm wavelength, which decreases with higher wavelengths, and the peak in the photocurrent around zero gate voltage is distinguished from conventional MoS2 FETs, which show a continuous increase in photocurrent with back-gate voltage.
Journal ArticleDOI
Infrared Photodetection Based on Colloidal Quantum-Dot Films with High Mobility and Optical Absorption up to THz
Emmanuel Lhuillier,Marion Scarafagio,Patrick Hease,Brice Nadal,Hervé Aubin,Xiang Zhen Xu,Nicolas Lequeux,Gilles Patriarche,Sandrine Ithurria,Benoit Dubertret +9 more
TL;DR: A new generation of colloidal QD-based photodetectors are proposed, which demonstrate detectivity improved by 2 orders of magnitude, and optical absorption that can be continuously tuned between 3 and 20 μm, which pave the way for the development of the next generation mid- and far-infrared low-cost detectors and camera.
Journal Article
Gate-Variable Optical Transitions in Graphene
Feng Wang,Yuanbo Zhang,Chuanshan Tian,Caglar Girit,Alex Zettl,Michael F. Crommie,Y. Ron Shen +6 more
TL;DR: The strong and layer-dependent optical transitions of graphene and the tunability by simple electrical gating hold promise for new applications in infrared optics and optoelectronics.
Journal ArticleDOI
Progress of Photodetectors Based on the Photothermoelectric Effect.
TL;DR: By introducing hot-carrier transport into low-dimensional material-based PTE detectors, the response time has been successfully pushed down to the picosecond level, and some potential strategies to further improve the performance are proposed.
References
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Book
Handbook of Optical Constants of Solids
TL;DR: In this paper, E.D. Palik and R.R. Potter, Basic Parameters for Measuring Optical Properties, and W.W.Hunter, Measurement of Optical Constants in the Vacuum Ultraviolet Spectral Region.
Journal ArticleDOI
Superior Thermal Conductivity of Single-Layer Graphene
Alexander A. Balandin,Suchismita Ghosh,Wenzhong Bao,Irene Calizo,Desalegne Teweldebrhan,Feng Miao,Chun Ning Lau +6 more
TL;DR: The extremely high value of the thermal conductivity suggests that graphene can outperform carbon nanotubes in heat conduction and establishes graphene as an excellent material for thermal management.
Journal ArticleDOI
Large-Area Synthesis of High-Quality and Uniform Graphene Films on Copper Foils
Xuesong Li,Weiwei Cai,Jinho An,Seyoung Kim,Junghyo Nah,Dongxing Yang,Richard D. Piner,Aruna Velamakanni,Inhwa Jung,Emanuel Tutuc,Sanjay K. Banerjee,Luigi Colombo,Rodney S. Ruoff +12 more
TL;DR: It is shown that graphene grows in a self-limiting way on copper films as large-area sheets (one square centimeter) from methane through a chemical vapor deposition process, and graphene film transfer processes to arbitrary substrates showed electron mobilities as high as 4050 square centimeters per volt per second at room temperature.
Journal ArticleDOI
Graphene photonics and optoelectronics
TL;DR: Graphene has high mobility and optical transparency, in addition to flexibility, robustness and environmental stability as discussed by the authors, and its true potential lies in photonics and optoelectronics, where the combination of its unique optical and electronic properties can be fully exploited, even in the absence of a bandgap, and the linear dispersion of the Dirac electrons enables ultrawideband tunability.
Journal ArticleDOI
A graphene-based broadband optical modulator
Ming Liu,Xiaobo Yin,Erick Ulin-Avila,Baisong Geng,Thomas Zentgraf,Long Ju,Feng Wang,Feng Wang,Xiang Zhang,Xiang Zhang +9 more
TL;DR: Graphene-based optical modulation mechanism, with combined advantages of compact footprint, low operation voltage and ultrafast modulation speed across a broad range of wavelengths, can enable novel architectures for on-chip optical communications.