Microwave-to-optical conversion using lithium niobate thin-film acoustic resonators
Microwave-to-optical conversion using lithium niobate thin-film acoustic resonators
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DOI：
10.1364/optica.6.001498
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发表时间：
2019-12-20
期刊：
影响因子：
10.4
通讯作者：
Loncar, Marko
中科院分区：
文献类型：
--
作者：
Shao, Linbo;Yu, Mengjie;Loncar, Marko
声学或机械谐振器已经成为一种很有前途的手段来调解微波到光的有效转换。在这里，我们展示了利用悬浮铌酸锂薄膜上的光力学相互作用，将频率高达4.5 GHz的微波转换为1500 nm波长的光。我们的方法使用一个数字间换能器驱动一个独立的100 μ m长的薄膜声谐振器来调制在马赫-曾德尔干涉仪或跑道腔中传播的光。换能器提供的强微波-声耦合以及铌酸锂的强光弹性、压电和电光效应使我们能够分别为马赫-曾德尔干涉仪和赛道谐振器实现V-pi = 4.6 V和V-pi = 0.77 V的半波电压。声光赛马场腔的光机械单光子耦合强度为1.1 kHz。为了突出我们系统的多功能性，我们还展示了一个具有单位增益的微波光子链路，这是指在光通道上传输0 dB的微波功率。我们的集成纳米光子平台，利用铌酸锂的引人注目的特性，可以帮助实现微波和光场之间的有效转换。(c)根据OSA开放获取出版协议的条款，2019年美国光学学会
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 mu m-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-pi = 4.6 V and V-pi = 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. (c) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement