Silicon-Phosphorene Nanocavity-Enhanced Optical Emission at Telecommunications Wavelengths

Chad Husko*, Joohoon Kang, Gregory Moille, Joshua D. Wood, Zheng Han, David Gosztola, Xuedan Ma, Sylvain Combrié, Alfredo De Rossi, Mark C. Hersam, Xavier Checoury, Jeffrey R. Guest

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Generating and amplifying light in silicon (Si) continues to attract significant attention due to the possibility of integrating optical and electronic components in a single material platform. Unfortunately, silicon is an indirect band gap material and therefore an inefficient emitter of light. With the rise of integrated photonics, the search for silicon-based light sources has evolved from a scientific quest to a major technological bottleneck for scalable, CMOS-compatible, light sources. Recently, emerging two-dimensional materials have opened the prospect of tailoring material properties based on atomic layers. Few-layer phosphorene, which is isolated through exfoliation from black phosphorus (BP), is a great candidate to partner with silicon due to its layer-tunable direct band gap in the near-infrared where silicon is transparent. Here we demonstrate a hybrid silicon optical emitter composed of few-layer phosphorene nanomaterial flakes coupled to silicon photonic crystal resonators. We show single-mode emission in the telecommunications band of 1.55 μm (Eg = 0.8 eV) under continuous wave optical excitation at room temperature. The solution-processed few-layer BP flakes enable tunable emission across a broad range of wavelengths and the simultaneous creation of multiple devices. Our work highlights the versatility of the Si-BP material platform for creating optically active devices in integrated silicon chips.

Original languageEnglish (US)
Pages (from-to)6515-6520
Number of pages6
JournalNano letters
Volume18
Issue number10
DOIs
StatePublished - Oct 10 2018

Keywords

  • nanomaterials
  • nanophotonics
  • phosphorene
  • silicon optical emission
  • silicon photonics
  • two-dimensional materials

ASJC Scopus subject areas

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

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