Switching of Photonic Crystal Lasers by Graphene

Min Soo Hwang, Ha Reem Kim, Kyoung Ho Kim, Kwang Yong Jeong, Jin Sung Park, Jae Hyuck Choi, Ju Hyung Kang, Jung Min Lee, Won Il Park, Jung Hwan Song, Min Kyo Seo, Hong Kyu Park

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Unique features of graphene have motivated the development of graphene-integrated photonic devices. In particular, the electrical tunability of graphene loss enables high-speed modulation of light and tuning of cavity resonances in graphene-integrated waveguides and cavities. However, efficient control of light emission such as lasing, using graphene, remains a challenge. In this work, we demonstrate on/off switching of single- and double-cavity photonic crystal lasers by electrical gating of a monolayer graphene sheet on top of photonic crystal cavities. The optical loss of graphene was controlled by varying the gate voltage Vg, with the ion gel atop the graphene sheet. First, the fundamental properties of graphene were investigated through the transmittance measurement and numerical simulations. Next, optically pumped lasing was demonstrated for a graphene-integrated single photonic crystal cavity at Vg below −0.6 V, exhibiting a low lasing threshold of ∼480 μW, whereas lasing was not observed at Vg above −0.6 V owing to the intrinsic optical loss of graphene. Changing quality factor of the graphene-integrated photonic crystal cavity enables or disables the lasing operation. Moreover, in the double-cavity photonic crystal lasers with graphene, switching of individual cavities with separate graphene sheets was achieved, and these two lasing actions were controlled independently despite the close distance of ∼2.2 μm between adjacent cavities. We believe that our simple and practical approach for switching in graphene-integrated active photonic devices will pave the way toward designing high-contrast and ultracompact photonic integrated circuits.

Original languageEnglish
Pages (from-to)1892-1898
Number of pages7
JournalNano Letters
Volume17
Issue number3
DOIs
Publication statusPublished - 2017 Mar 8

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Photonic crystals
Graphene
graphene
photonics
Lasers
crystals
lasers
cavities
lasing
Optical losses
Photonic devices
Light emission
Photonics
integrated circuits
light emission
Integrated circuits

Keywords

  • Graphene
  • nanolasers
  • photonic crystals
  • switching

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

Hwang, M. S., Kim, H. R., Kim, K. H., Jeong, K. Y., Park, J. S., Choi, J. H., ... Park, H. K. (2017). Switching of Photonic Crystal Lasers by Graphene. Nano Letters, 17(3), 1892-1898. https://doi.org/10.1021/acs.nanolett.6b05207

Switching of Photonic Crystal Lasers by Graphene. / Hwang, Min Soo; Kim, Ha Reem; Kim, Kyoung Ho; Jeong, Kwang Yong; Park, Jin Sung; Choi, Jae Hyuck; Kang, Ju Hyung; Lee, Jung Min; Park, Won Il; Song, Jung Hwan; Seo, Min Kyo; Park, Hong Kyu.

In: Nano Letters, Vol. 17, No. 3, 08.03.2017, p. 1892-1898.

Research output: Contribution to journalArticle

Hwang, MS, Kim, HR, Kim, KH, Jeong, KY, Park, JS, Choi, JH, Kang, JH, Lee, JM, Park, WI, Song, JH, Seo, MK & Park, HK 2017, 'Switching of Photonic Crystal Lasers by Graphene', Nano Letters, vol. 17, no. 3, pp. 1892-1898. https://doi.org/10.1021/acs.nanolett.6b05207
Hwang MS, Kim HR, Kim KH, Jeong KY, Park JS, Choi JH et al. Switching of Photonic Crystal Lasers by Graphene. Nano Letters. 2017 Mar 8;17(3):1892-1898. https://doi.org/10.1021/acs.nanolett.6b05207
Hwang, Min Soo ; Kim, Ha Reem ; Kim, Kyoung Ho ; Jeong, Kwang Yong ; Park, Jin Sung ; Choi, Jae Hyuck ; Kang, Ju Hyung ; Lee, Jung Min ; Park, Won Il ; Song, Jung Hwan ; Seo, Min Kyo ; Park, Hong Kyu. / Switching of Photonic Crystal Lasers by Graphene. In: Nano Letters. 2017 ; Vol. 17, No. 3. pp. 1892-1898.
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