Cheng, Zhao

Ding, Yunhong

Dong, Jianji

Galili, Michael

Hu, Hao

Mortensen, N. Asger

Oxenløwe, Leif Katsuo

Xiao, Sanshui

Yvind, Kresten

Zhu, Xiaolong

We demonstrate a waveguide-coupled integrated graphene plasmonic photodetector on a silicon-oninsulator platform and achieve an integrated small-footprint photodetector working at the telecommunication window, with the bandwidth beyond 110 GHz and intrinsic responsivity of 360 mA/W

Online Research Database In Technology

  General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.   Users may download and print one copy of any publication from the public portal for the purpose of private study or research.  You may not further distribute the material or use it for any profit-making activity or commercial gain  You may freely distribute the URL identifying the publication in the public portal  If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.         Downloaded from orbit.dtu.dk on: Sep 11, 2019Graphene plasmonic photodetector with the bandwidth beyond 110 GHzDing, Yunhong; Cheng, Zhao ; Zhu, Xiaolong; Yvind, Kresten; Dong, Jianji; Galili, Michael; Hu, Hao;Mortensen, N. Asger; Xiao, Sanshui ; Oxenløwe, Leif KatsuoPublication date:2019Document VersionPublisher's PDF, also known as Version of recordLink back to DTU OrbitCitation (APA):Ding, Y., Cheng, Z., Zhu, X., Yvind, K., Dong, J., Galili, M., ... Oxenløwe, L. K. (2019). Graphene plasmonicphotodetector with the bandwidth beyond 110 GHz. Abstract from 9th International Conference on SurfacePlasmon Photonics, Copenhagen, Denmark.   Graphene plasmonic photodetector with the bandwidth beyond 110 GHz  Yunhong Ding1,2, Zhao Cheng1,6, Xiaolong Zhu5, Kresten Yvind1,2, Jianji Dong,6, Michael Galili1,2, Hao Hu1,2, N. Asger Mortensen3,4, Sanshui Xiao1,4, Leif Katsuo Oxenløwe1,2 1. Department of Photonics Engineering, Technical University of Denmark, 2800 Kgs. Lyngby Denmark 2. Center for Silicon Photonics for Optical Communication (SPOC), Technical University of Denmark,2800, Kgs. Lyngby, Denmark  3. Center for Nano Optics and Danish Institute for Advanced Study, University of Southern Denmark, Campusvej 55, DK-5230 Odense M, Denmark 4. Center for Nanostructured Graphene (CNG), Technical University of Denmark, 2800 Kgs. Lyngby Denmark 5. Department of Health technology, Technical University of Denmark, 2800 Kgs. Lyngby Denmark 6. Wuhan National Lab, for Optoelectronics, Huazhong University of Science and Technology, 430074, Wuhan, China  Abstract: We demonstrate a waveguide-coupled integrated graphene plasmonic photodetector on a silicon-on-insulator platform and achieve an integrated small-footprint photodetector working at the telecommunication window, with the bandwidth beyond 110 GHz and intrinsic responsivity of 360 mA/W.   Graphene, a unique two-dimensional material, provides great potential in the realization of high-performance optoelectronic devices. In particular, significant efforts have been devoted to graphene photodetectors [1]. The distinct properties of graphene in terms of ultrahigh carrier mobility, zero bandgap property that enables wavelength-independent light absorption over a very wide spectral range, and tunable optoelectronic properties give rise to realize graphene photodetectors with large spectral bandwidth and high speed. However, their performance is still limited by weak light-graphene interaction and large resistance-capacitance product. Due to the weak light-matter interaction, the size of devices has to be at least tens to hundreds of microns to achieve a reasonable responsivity, thus limiting high-speed operation. A small device however gives weak absorption of light, and thus eventually low responsivity. So far, the state-of-the-art bandwidth of the graphene photodetector is ∼76 GHz, however with a modest responsivity of 1 mA/W [2]. Here, we report an ultra-compact, on-chip, and high-speed graphene photodetector based on a plasmonic slot waveguide. The subwavelength confinement of the plasmonic mode gives rise to the enhanced light-graphene interactions [3,4,5], and the narrow plasmonic slot of 120 nm enables short drift paths for photogenerated carriers. The schematic of the proposed graphene plasmonic hybrid photodetector is shown in Fig. 1(A), where the light from a fiber is first coupled to a silicon waveguide through a grating coupler and further to the plasmonic slot waveguide by a short taper structure. Fig. 1(B) shows a fabricated graphene-plasmonic photodetector, where the dashed lines represent the graphene coverage boundary, and the corresponding optical bandwidth measured by VNA, impulse response, and frequency beating with ESA is presented at the bias voltage of 1.6 V, showing that the bandwidth is over 110GHz. The performance is comparable with a state-of-the-art commercial 100 GHz semiconductor photodetector [6], and can further be improved significantly. Moreover, the use of chemical-vapourdeposition(CVD)-growth graphene here allows for the scalable fabrication and we believe that our work greatly pushes the 2D material towards practical applications, e.g. in optical interconnects, high-speed optical communications, and so on.   Fig. 1 (a) Schematic of the proposed graphene-plasmonic hybrid photodetector (b) An example of fabricated graphene plasmonic photodetector with the graphene coverage length of 2.7 um (c) Its corresponding optical bandwidth measured by VNA, impulse response, and frequency beating with ESA at the bias voltage of 1.6V.  References [1] F. Xia, T. Mueller, Y. Lin, A. Valdes-Garcia, and P. Avouris."Ultrafast graphene photodetector," Nature Nanotechnol 4, 839– 843 (2009). [2] D. Schall, C. Porschatis, M. Otto, and D. Neumaier. "Graphene photodetectors with a bandwidth >76 GHz fabricated in a 600 wafer process line," J. Phys. D: Appl. Phys. 50, 124004 (2017). [3] M. Ayata et al., "High-speed plasmonic modulator in a single metal layer," Science 358, 630–632 (2017). [4] Y. Salamin et al. "100 GHz Plasmonic Photodetector," ACS Photon. 5, 3291-3297 (2018). [5] Y. Ding, Z. Chen, X. Zhu, K. Yvind, J. Dong, M. Galili, H. Hu, N. A. Mortensen, S. Xiao, and L. K. Oxenløwe, “Ultra-compact integrated graphene plasmonic photodetector with bandwidth over 110 GHz”, submitted (2018). arXiv:1808.04815 [6] FINISAR 100 GHz Single High-speed Photodetector, https://www.finisar.com/communication-components/xpdv412xr 

Graphene plasmonic photodetector with the bandwidth beyond 110 GHz

https://orbit.dtu.dk/ws/files/188189177/Yunhong_Abstract_SPP9.pdf

Graphene plasmonic photodetector with the bandwidth beyond 110 GHz

Abstract

Similar works

Full text

Available Versions

Online Research Database In Technology