Whispering gallery modes (WGM) of optical microresonators can feature long photon lifetime and small mode volume. The realisation that these devices exhibit co-localised mechanical modes coupled via radiation pressure to the WGM enabled dynamical backaction physics and a variety of other optomechanical phenomena to be observed …

Abstract. Whispering gallery mode resonators (WGMRs) have achieved significant results due to their unique properties such as extremely small mode volume, …

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The WGM barcode technique integrates high-sensitivity, high-resolution, and large-dynamic-range measurement into a high-performance sensing platform …

When two high-Q WGM resonators are coupled, resonances from each hybridize to form symmetric and antisymmetric eigenmodes. Two spectral lines can hence be monitored and used as a multimode sensing mechanism. ... a membrane mounted on top of the microsphere can be used as a transducer for the pressure. In this case, the …

The resonator was fabricated with vacuum UV grade CaF 2 and its Q factor was limited by residual contamination of the surface with polishing agents.. It was found that when an excimer grade CaF 2 is used, it is possible to achieve a Q factor higher than in any other open resonator and any other WGM resonator. The 5.5 mm in diameter CaF 2 …

Multiple strain-based WGM sensors are demonstrated in the literature for the measurement of quantities such as pressure (Ioppolo and Ötügen, 2007), force (Ioppolo et al., 2008), temperature ...

As a sensing platform that strongly enhances light-matter interactions, whispering-gallery mode (WGM) microresonators have been used for the detection of not only physical matters, such as nanoparticles, small bio/chemical molecules, or gases, but also physical parameters or fields surrounding the resonator that influence the optical …

Then, a cross-correlation technique is used to determine the WGM shift at time t = t 0 +t relative to a reference spectrum that is acquired at time t 0 that represents zero gage pressure (Fig. 3).

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Due to the high Q-factor of the WGM, a low lasing threshold can be achieved for pulsed laser excitations of ~1 μJ mm −2. A large fraction of the mode intensity extends into the capillary, where ...

The extremely high precision in combination with a 0.5 μm-wide microcapillary opening allows us to carry out measurements on very small droplets, …

dispersed WGM the pressure of which can be increased . ... High-viscosity heavy oil requires a higher air injection pressure and will remain in the high-pressure stage for a longer period of time ...

Furthermore, when decreasing pressure, changes in the Fluorescence Intensity Ratio (FIR) of the 2 H 9/2, 4 F 5/2 → 4 I 9/2 (820 nm) and 4 F 3/2 → 4 I 9/2 (890 nm) Nd 3+ transitions as well as a red-shift of the WGM was observed. Both changes were calibrated as a function of pressure.

An ASE light source with center wavelength of 1 µm was employed to excite a high-Q Yb/Er co-doped silica microsphere with the advantage of resisting the interference of vibration and temperature changes. A stable single-mode laser at approximate 1595 nm was generated due to the polarization insensitivity of the ASE light source.The maximum …

We present a comprehensive overview of sensor technology exploiting optical whispering gallery mode (WGM) resonances. After a short introduction we begin by …

Optical whispering-gallery mode (WGM) microresonators, confining resonant photons in a microscale volume for long periods of time, strongly enhance light-matter interactions, making them an ideal platform for photonic sensors. One of the features of WGM sensors is their capability to respond to environmental perturbations that influence the optical mode …

Further investigations demonstrated that the WGM shift has a high force sensitivity (~ 19.7 pm/μN) of the gravitation when the microcavity is stretched by a weight. ... Wang G Z, Zhao M M, Ma J Y, et al. Radiation-pressure-driven mechanical oscillations in silica microdisk resonators on chip. Sci China-Phys Mech Astron, 2015, 58: 050307.

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1. Introduction. Due to the outstanding advantages of low cost, compact size, high sensitivity, high flexibility and good electromagnetic interference immunity, optical fiber relative humidity (RH) sensors based on fiber device and humidity-sensitive material coating have been widely researched and applied in multiple fields, such as meteorology, …

This highly sensitive method opens new horizons in luminescence spectroscopy, i.e., optical sensing of ultralow pressure values with high‐spatial resolution, enabling remote determination of ...

Capillary microcavity Whispering gallery mode (WGM) resonators with high Q and small mode volume are well suited for applications in high sensitivity sensing. …

High-quality WGM optical resonators that confine light in a small volume via total internal reflection can significantly enhance the light–matter interactions, which have benefited a number of ...

In-fiber whispering gallery mode (WGM) microsphere resonators have received remarkable attention due to the superiorities of compact structure, high stability and self-alignment. As an in-fiber structure, WGM microsphere resonators have been demonstrated in various applications, such as sensors, filters and lasers, which have …

Microbottle resonators (MBR) are bottle-like structures fabricated by varying the radius of an optical fiber. MBRs can support whispering gallery modes (WGM) by the total internal reflection of the light coupled into the MBRs. MBRs have a significant advantage in sensing and other advanced optical applications due to their light …

(a) Numerical model (COMSOL) of double WGM excitation in a dielectric (TiO 2) microsphere (R, n) placed in air near a plane gold membrane and illuminated by a plane optical wave (k) with circular polarization; PML is the region of perfectly matched layers; the blue and red arrows denote scattered and reflected waves, respectively.(b …

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The WGM wavelength over time is composed of a slow background drift (due to ambient temperature and pressure fluctuation [126]), a high-frequency noise (corresponding to laser linewidth as ...

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