All-Optical Modulation in Chains of Silicon Nanoantennas

Lu Ding, Dmitry Morits, Reuben Bakker, Shiqiang Li, Damien Eschimese, Shiyang Zhu, Ye Feng Yu, Ramon Paniagua-Dominguez, Arseniy I. Kuznetsov

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (Scopus)

Abstract

Dielectric nanoantennas represent a new branch of nanophotonics that allows efficient control of light scattering at nanoscale. Coupled nanoantennas can guide light on a chip over large distances without radiation losses, enabling a new nanoantenna-based silicon photonics platform with enchanced functionalities for light-on-chip integration. Here, an all-optical on-chip modulator based on a one-dimensional chain of silicon nanoantennas is proposed and experimentally demonstrated in the 1.55 μm telecommunication wavelength range. A resonator, with a quality factor up to 104, is designed on the basis of a chain of coupled silicon nanoantennas, each supporting the electric dipole Mie resonance. Wafer-level fabrication of the nanoantennas is realized using CMOS compatible photolithography. High-speed modulation of the cavity mode is experimentally demonstrated via optical injection of free electrons and holes using a pulsed laser. The modulator is shown to have a response time of 50 ps and modulation depth beyond 25 dB, with 10 dB switching power being as low as âˆ50 fJ. Low power and high-speed switching of the proposed device combined with the large-scale fabrication capabilities pave the way to applications of this dielectric nanoantenna-based approach to industrial on-chip photonics.

Original languageEnglish
Pages (from-to)1001-1008
Number of pages8
JournalACS Photonics
Volume7
Issue number4
DOIs
Publication statusPublished - 15 Apr 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • dielectric nanoantenna
  • optical modulation
  • resonator
  • silicon photonics

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