arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2107.03033physics.opticscond-mat.mes-hallquant-ph
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分子光机械纳米腔连续波频率上转换

Continuous-Wave Frequency Upconversion with a Molecular Optomechanical Nanocavity

Wen Chen, Philippe Roelli, Huatian Hu, Sachin Verlekar, Sakthi Priya Amirtharaj, Angela I. Barreda, Tobias J. Kippenberg, Miroslavna Kovylina, Ewold Verhagen, A… 展开作者

Wen Chen, Philippe Roelli, Huatian Hu, Sachin Verlekar, Sakthi Priya Amirtharaj, Angela I. Barreda, Tobias J. Kippenberg, Miroslavna Kovylina, Ewold Verhagen, Alejandro Martínez, Christophe Galland

摘要:

频率上转换是电磁信号处理、分析和检测的基石。它用于将能量和信息从一个频域传输到另一个频域,其中传输,调制或检测在技术上更容易或更有效。光机转换是一种灵活的相干频率上转换方法,它已成功地证明了从无线电和微波(kHz到GHz)的光场转换。然而,多太赫兹和中红外信号的光机械转换仍然是一个开放的挑战。在这里,我们利用分子腔光学力学来演示在环境条件下,在$\sim$ 32~THz的亚微瓦连续波信号到可见光域的上转换。该装置包括一个容纳少量分子的等离子体纳米腔。入射场共振驱动集体分子振动,这在可见泵浦激光器上压印了光机械调制,并导致斯托克斯和反斯托克斯上转换拉曼边带具有亚自然线宽,表明相干过程。与自由空间相比,纳米腔提供了13个数量级的每分子上转换效率的增强,测量的声子-光子内部转换效率大于每毫瓦泵浦功率的$10^{-4}$。我们的研究结果建立了一个灵活的范例,光机械频率转换使用分子振荡器耦合到等离子体纳米腔,其振动和电磁特性可以定制的意愿,使用化学工程和纳米纤维。

英文摘要:

Frequency upconversion is a cornerstone of electromagnetic signal processing, analysis and detection. It is used to transfer energy and information from one frequency domain to another where transmission, modulation or detection is technically easier or more efficient. Optomechanical transduction is emerging as a flexible approach to coherent frequency upconversion; it has been successfully demonstrated for conversion from radio- and microwaves (kHz to GHz) to optical fields. Nevertheless, optomechanical transduction of multi-THz and mid-infrared signals remains an open challenge. Here, we utilize molecular cavity optomechanics to demonstrate upconversion of sub-microwatt continuous-wave signals at $\sim$32~THz into the visible domain at ambient conditions. The device consists in a plasmonic nanocavity hosting a small number of molecules. The incoming field resonantly drives a collective molecular vibration, which imprints an optomechanical modulation on a visible pump laser and results in Stokes and anti-Stokes upconverted Raman sidebands with sub-natural linewidth, indicating a coherent process. The nanocavity offers 13 orders of magnitude enhancement of upconversion efficiency per molecule compared to free space, with a measured phonon-to-photon internal conversion efficiency larger than $10^{-4}$ per milliwatt of pump power. Our results establish a flexible paradigm for optomechanical frequency conversion using molecular oscillators coupled to plasmonic nanocavities, whose vibrational and electromagnetic properties can be tailored at will using chemical engineering and nanofabrication.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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