Microwave-to-optical conversion using lithium niobate thin-film acoustic resonators

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

8 Scopus Citations
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Author(s)

  • Linbo Shao
  • Mengjie Yu
  • Smarak Maity
  • Neil Sinclair
  • Lu Zheng
  • Cleaven Chia
  • Amirhassan Shams-Ansari
  • Mian Zhang
  • Keji Lai
  • Marko Lončar

Detail(s)

Original languageEnglish
Pages (from-to)1498-1505
Journal / PublicationOptica
Volume6
Issue number12
Online published2 Dec 2019
Publication statusPublished - 20 Dec 2019

Abstract

Acoustic or mechanical resonators have emerged as a promising means to mediate efficient microwave-to-optical conversion. Here, we demonstrate conversion of microwaves up to 4.5 GHz in frequency to 1500 nm wavelength light using optomechanical interactions on suspended thin-film lithium niobate. Our method uses an interdigital transducer that drives a freestanding 100 μm-long thin-film acoustic resonator to modulate light traveling in a Mach–Zehnder interferometer or racetrack cavity. The strong microwave-to-acoustic coupling offered by the transducer in conjunction with the strong photoelastic, piezoelectric, and electro-optic effects of lithium niobate allows us to achieve a half-wave voltage of V π = 4.6 V and V π = 0.77 V for the Mach–Zehnder interferometer and racetrack resonator, respectively. The acousto-optic racetrack cavity exhibits an optomechanical single-photon coupling strength of 1.1 kHz. To highlight the versatility of our system, we also demonstrate a microwave photonic link with unitary gain, which refers to a 0 dB microwave power transmission over an optical channel. Our integrated nanophotonic platform, which leverages the compelling properties of lithium niobate, could help enable efficient conversion between microwave and optical fields.

Research Area(s)

  • TRANSDUCTION, WAVES

Citation Format(s)

Microwave-to-optical conversion using lithium niobate thin-film acoustic resonators. / Shao, Linbo; Yu, Mengjie; Maity, Smarak; Sinclair, Neil; Zheng, Lu; Chia, Cleaven; Shams-Ansari, Amirhassan; Wang, Cheng; Zhang, Mian; Lai, Keji; Lončar, Marko.

In: Optica, Vol. 6, No. 12, 20.12.2019, p. 1498-1505.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal