Sensing platforms based upon photonic integrated circuits have shown considerable promise; however, they require corresponding advancements in integrated optical readout technologies. Here, we present an on-chip spectrometer that leverages an integrated thin-film lithium niobate modulator to produce a frequency-agile electro-optic frequency comb for interrogating chip-scale temperature and acceleration sensors. The chirped comb process allows for ultralow radiofrequency drive voltages, which are as much as seven orders of magnitude less than the lowest found in the literature and are generated using a chip-scale, microcontroller-driven direct digital synthesizer. The on-chip comb spectrometer is able to simultaneously interrogate both an on-chip temperature sensor and an off-chip, microfabricated optomechanical accelerometer with cutting-edge sensitivities of \approx \!{5}\;\unicode{x00B5} {\rm K} \cdot {{\rm Hz}^{- 1/2}}$\approx \!{5}\;\unicode{x00B5} {\rm K} \cdot {{\rm Hz}^{- 1/2}}$ and \approx \!{130}\;\unicode{x00B5}{\rm m} \cdot {{\rm s}^{- 2}} \cdot {{\rm Hz}^{- 1/2}}$\approx \!{130}\;\unicode{x00B5}{\rm m} \cdot {{\rm s}^{- 2}} \cdot {{\rm Hz}^{- 1/2}}$, respectively. This platform is compatible with a broad range of existing photonic integrated circuit technologies, where its combination of frequency agility and ultralow radiofrequency power requirements are expected to have applications in fields such as quantum science and optical computing.

中文翻译：

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用于集成传感器的低功耗、敏捷电光频率梳光谱仪

基于光子集成电路的传感平台已显示出巨大的前景；然而，它们需要集成光学读出技术的相应进步。在这里，我们提出了一种片上光谱仪，它利用集成薄膜铌酸锂调制器来产生频率捷变的电光频率梳，用于询问芯片级温度和加速度传感器。啁啾梳状工艺可实现超低射频驱动电压，该电压比文献中发现的最低电压低七个数量级，并使用芯片级微控制器驱动的直接数字合成器生成。片上梳状光谱仪能够同时询问片上温度传感器和片外微加工光机械加速度计，其尖端灵敏度为\approx \!{5}\;\unicode{x00B5} {\rm K} \cdot {{\rm Hz}^{- 1/2}}$\approx \!{5}\;\unicode{x00B5} {\rm K} \cdot {{\rm Hz}^{- 1/2}}$和\approx \!{130}\;\unicode{x00B5}{\rm m} \cdot {{\rm s}^{- 2 }} \cdot {{\rm Hz}^{- 1/2}}$\approx \!{130}\;\unicode{x00B5}{\rm m} \cdot {{\rm s}^{- 2}} \cdot {{\rm Hz}^{- 1/2}}$分别。该平台与广泛的现有光子集成电路技术兼容，其频率捷变和超低射频功率要求的结合预计将在量子科学和光计算等领域得到应用。