arXiv subjects

Jialve Sun

Publications and source records attributed to Jialve Sun.

4 recordsLinked to original sources

arXiv2025

WGM microprobe device for high-sensitivity and broadband ultrasound detection

Whispering-gallery-mode (WGM) microcavities have emerged as a promising alternative to traditional ultrasound probes, offering high sensitivity and wide bandwidth. In our research, we propose a novel silica WGM microprobe device, with impressive Q factors up to 10^7.The side-coupled approach and special encapsulation design make the device small, robust, and capable of utilizing in both gaseous and liquid environments.We have successfully conducted photoacoustic (PA) imaging on various samples using this device which demonstrates a high sensitivity of 5.4 mPa/sqrt(Hz) and a board bandwidth of 41 MHz at -6 dB for ultrasound. What's more, it's capable of capturing the vibration spectrum of microparticles up to a few hundred megahertz. Our compact and lightweight device exhibits significant application potential in PA endoscopic detection, near-field ultrasound sensing and other aspects.

physics.optics↗

arXiv2023

Single-particle vibrational spectroscopy using optical microresonators

Vibrational spectroscopy is a ubiquitous technology that derives the species, constituents, and morphology of an object from its natural vibrations. However, the vibrational spectra of mesoscopic particles - including most biological cells - have remained hidden from existing technologies. These particles are expected to vibrate faintly at megahertz to gigahertz rates, imposing unpractical sensitivity and resolution for current optical and piezoelectric spectroscopy. Here we demonstrate the real-time measurement of natural vibrations of single mesoscopic particles using an optical microresonator, extending the reach of vibrational spectroscopy to a new spectral window. Conceptually, a spectrum of vibrational modes of the particles is stimulated photoacoustically, and correlated to a high-quality-factor optical resonance for the ultrasensitive readout. Experimentally, this scheme is testified by measuring mesoscopic particles with different constituents, sizes, and internal structures, showing an unprecedented signal-to-noise ratio of 50 dB and detection bandwidth over 1 GHz. This new technology is further applied for the biomechanical fingerprinting of single microbial cells with different species and living states. The present method opens up new avenues to study single-particle mechanical properties in vibrational degrees of freedom, and may find applications in photoacoustic sensing and imaging, cavity optomechanics and biomechanics.

physics.optics↗

arXiv2023

Robust Packaged Fiber-Microcavity Device with over One Billion Q-factor

Whispering gallery mode (WGM) microcavities can confine photons within a microscale volume for long periods of time, strongly enhancing light-matter interactions, and making it a crucial platform in optical science and applications. Current research on microcavity coupling system relays on precise mechanical coupling with microscope monitoring, and its resonance properties are extremely sensitive to external interference, which greatly limits the practical application of microcavities. Therefore, a novel packaged fiber-microcavity device with air/water tightness and stable temperature characteristics is proposed in this paper. A variety of fixatives with different Young's modulus gradients and low coefficients of thermal expansion are used to design a package structure with overall vibration isolation and buffering effect, in order to ensure the stability of the transmission spectrum and improve the robustness of the microcavity module. Through the performance characterization test of the device, it is proved that the packaged microcavities can maintain a quality factor as high as 10^9, and has the advantages of compact size, strong robustness, and versatility. This research work is of great significance to promote the large-scale application of WGMs in high-speed optical communication, nonlinear optics, narrow linewidth lasers, and ultra-high sensitivity sensing.

physics.app-ph↗

arXiv2022

High sensitivity air-coupled MHz frequency ultrasound detection using on-chip microcavities

Owing to their dual-resonance enhanced sensitivity, cavity optomechanical systems provide an ideal platform for ultrasound sensing. In this work, we realize high sensitivity air-coupled ultrasound sensing from kilohertz (kHz) to megahertz (MHz) frequency range based on whispering gallery mode microcavities. Using a 57 um-diameter microtoroid with high optical Q factor (~10^7) and mechanical Q factor (~700), we achieve sensitivities of 46 uPa Hz^{-1/2}-10 mPa Hz^{-1/2} in a frequency range of 0.25-3.2 MHz. Thermal-noise-limited sensitivity is realized around the mechanical resonance at 2.56 MHz, in a frequency range of 0.6 MHz. We also observe the second- and third-order mechanical sidebands, and quantitatively study the intensities of each mechanical sideband as a function of the mechanical displacement. Measuring the combination of signal to noise ratios at all sidebands has the potential to extend the dynamic range of ultrasound sensing. In addition, to improve the ultrasound sensitivity in the kHz frequency range, we use a microdisk with a diameter of 200 um, and achieve sensitivities of 1.83 uPa Hz^{-1/2}-10.4 mPa Hz^{-1/2} in 30 kHz-1.65 MHz range.

physics.optics↗