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Graphene electro-optic modulator with 30 GHz bandwidth

Nature Photonics volume 9, pages 511–514 (2015)Cite this article

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Abstract

Graphene has generated exceptional interest as an optoelectronic material1,2 because its high carrier mobility3,4 and broadband absorption5 promise to make extremely fast and broadband electro-optic devices possible6,7,8,9. Electro-optic graphene modulators previously reported, however, have been limited in bandwidth to a few gigahertz10,11,12,13,14,15 because of the large capacitance required to achieve reasonable voltage swings. Here, we demonstrate a graphene electro-optic modulator based on resonator loss modulation at critical coupling16 that shows drastically increased speed and efficiency. Our device operates with a 30 GHz bandwidth and with a state-of-the-art modulation efficiency of 15 dB per 10 V. We also show the first high-speed large-signal operation in a graphene modulator, paving the way for fast digital communications using this platform. The modulator uniquely uses silicon nitride waveguides, an otherwise completely passive material platform, with promising applications for ultra-low-loss broadband structures and nonlinear optics.

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Figure 1: Critical coupling effect.
Figure 2: Device design.
Figure 3: Electrical response.

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References

  1. Novoselov, K. S. et al. A roadmap for graphene. Nature 490, 192–200 (2012).

    ADS  Google Scholar 

  2. Bonaccorso, F., Sun, Z., Hasan, T. & Ferrari, A. C. Graphene photonics and optoelectronics. Nature Photon. 4, 611–622 (2010).

    Article  ADS  Google Scholar 

  3. Bolotin, K. I. et al. Ultrahigh electron mobility in suspended graphene. Solid State Commun. 146, 351–355 (2008).

    Article  ADS  Google Scholar 

  4. Mayorov, A. S. et al. Micrometer-scale ballistic transport in encapsulated graphene at room temperature. Nano Lett. 11, 2396–2399 (2011).

    Article  ADS  Google Scholar 

  5. Mak, K. F. et al. Measurement of the optical conductivity of graphene. Phys. Rev. Lett. 101, 196405 (2008).

    Article  ADS  Google Scholar 

  6. Koester, S. J. & Li, M. High-speed waveguide-coupled graphene-on-graphene optical modulators. Appl. Phys. Lett. 100, 171107 (2012).

    Article  ADS  Google Scholar 

  7. Gosciniak, J. & Tan, D. T. H. Theoretical investigation of graphene-based photonic modulators. Sci. Rep. 3, 1897 (2013).

    Article  ADS  Google Scholar 

  8. Gan, X. et al. Chip-integrated ultrafast graphene photodetector with high responsivity. Nature Photon. 7, 883–887 (2013).

    Article  ADS  Google Scholar 

  9. Pospischil, A. et al. CMOS-compatible graphene photodetector covering all optical communication bands. Nature Photon. 7, 892–896 (2013).

    Article  ADS  Google Scholar 

  10. Liu, M. et al. A graphene-based broadband optical modulator. Nature 474, 64–67 (2011).

    Article  ADS  Google Scholar 

  11. Liu, M., Yin, X. & Zhang, X. Double-layer graphene optical modulator. Nano Lett. 12, 1482–1485 (2012).

    Article  ADS  Google Scholar 

  12. Youngblood, N., Anugrah, Y., Ma, R., Koester, S. J. & Li, M. Multifuncitonal graphene optical modulator and photodetector integrated on silicon waveguides. Nano Lett. 14, 2741–2746 (2014).

    Article  ADS  Google Scholar 

  13. Mohsin, M. et al. Graphene based low insertion loss electro-absorption modulator on SOI waveguide. Opt. Express 22, 15292–15297 (2014).

    Article  ADS  Google Scholar 

  14. Qiu, C. et al. Efficient modulation of 1.55 µm radiation with gated graphene on a silicon microring resonator. Nano Lett. 14, 6811–6815 (2014).

    Article  ADS  Google Scholar 

  15. Hu, Y. T. et al. Broadband 10 Gb/s graphene electro-absorption modulator on silicon for chip-level optical interconnects. Proc. 2014 IEEE Int. Electron Devices Meeting 5.6.1–5.6.4 (2014).

  16. Jacobs, B. C. & Franson, J. D. All-optical switching using the quantum Zeno effect and two-photon absorption. Phys. Rev. A 79, 063830 (2009).

    Article  ADS  Google Scholar 

  17. Wang, F. et al. Gate-variable optical transitions in graphene. Science 320, 206–209 (2008).

    Article  ADS  Google Scholar 

  18. Wen, Y. H., Kuzucu, O., Hou, T., Lipson, M. & Gaeta, A. L. All-optical switching of a single resonance in silicon ring resonators. Opt. Express 36, 1413–1415 (2011).

    Google Scholar 

  19. Midrio, M. et al. Graphene-assisted critically-coupled optical ring modulator. Opt. Express 20, 23144–23155 (2012).

    Article  ADS  Google Scholar 

  20. Gruhler, N. et al. High-quality Si3N4 circuits as a platform for graphene-based nanophotonic devices. Opt. Express 21, 31678–31689 (2013).

    Article  ADS  Google Scholar 

  21. Sherwood-Droz, N. & Lipson, M. Scalable 3D dense integration of photonics on bulk silicon. Opt. Express 19, 17758–17765 (2011).

    Article  ADS  Google Scholar 

  22. Fan, L. et al. Direct fabrication of silicon photonic devices on a flexible platform and its application for strain sensing. Opt. Express 20, 20564–20575 (2012).

    Article  ADS  Google Scholar 

  23. Li, X. et al. Large-area synthesis of high-quality and uniform graphene films on copper foils. Science 324, 1312–1314 (2009).

    Article  ADS  Google Scholar 

  24. Liang, X. et al. Toward clean and crackless transfer of graphene. ACS Nano 5, 9144–9153 (2011).

    Article  Google Scholar 

  25. Hsu, A., Wang, H., Kim, K. K., Kong, J. & Palacios, T. Impact of graphene interface quality on contact resistance and RF device performance. IEEE Electron Device Lett. 32, 1008–1010 (2011).

    Article  ADS  Google Scholar 

  26. Das, A. et al. Monitoring dopants by Raman scattering in an electrochemically top-gated graphene transistor. Nature Nanotech. 3, 210–215 (2008).

    Article  Google Scholar 

  27. Majumdar, A., Kim, J., Vuckovic, J. & Wang, F. Electrical control of silicon photonic crystal cavity by graphene. Nano Lett. 13, 515–518 (2013).

    Article  ADS  Google Scholar 

  28. Gan, X. et al. High-contrast electrooptic modulation of a photonic crystal nanocavity by electrical gating of graphene. Nano Lett. 13, 691–696 (2013).

    Article  ADS  Google Scholar 

  29. Li, W. et al. Ultraviolet/ozone treatment to reduce metal–graphene contact resistance. Appl. Phys. Lett. 102, 183110 (2013).

    Article  ADS  Google Scholar 

  30. Leong, W. S., Gong, H. & Thong, J. T. L. Low-contact resistance graphene devices with nickel-etched-graphene contacts. ACS Nano 8, 994–1001 (2014).

    Article  Google Scholar 

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Acknowledgements

The authors thank M. Blees and P.L. McEuen for discussions and graphene samples. This work was supported in part by the National Science Foundation (NSF) through CIAN ERC (grant no. EEC-0812072). C.T.P. acknowledges support from a NSF Graduate Research Fellowship (grant no. DGE-1144153). This work was performed in part at the Cornell NanoScale Facility, a member of the National Nanotechnology Infrastructure Network, which is supported by the NSF (grant no. ECCS-0335765). This work also made use of the Cornell Center for Materials Research Shared Facilities, which are supported through the NSF MRSEC program (DMR-1120296).

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Authors and Affiliations

  1. School of Electrical and Computer Engineering, Cornell University, Ithaca, 14850, New York, USA

    Christopher T. Phare, Yoon-Ho Daniel Lee, Jaime Cardenas & Michal Lipson

  2. Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, 14850, New York, USA

    Michal Lipson

Authors
  1. Christopher T. Phare
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  2. Yoon-Ho Daniel Lee
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  3. Jaime Cardenas
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  4. Michal Lipson
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Contributions

C.T.P. conceived the work, designed and fabricated the devices and prepared the manuscript. C.T.P. and Y.-H.D.L. performed the high-speed measurements. J.C. discussed the device design and assisted with sample fabrication. M.L. supervised the project and edited the manuscript.

Corresponding author

Correspondence to Michal Lipson.

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Competing interests

C.T.P. and M.L. are named inventors on US provisional patent application no. 62/076,938 regarding the technology reported in this Letter.

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Phare, C., Daniel Lee, YH., Cardenas, J. et al. Graphene electro-optic modulator with 30 GHz bandwidth. Nature Photon 9, 511–514 (2015). https://doi.org/10.1038/nphoton.2015.122

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