high pressure wgm

We propose and experimentally demonstrate the first tunable whispering gallery mode (WGM) photonic device based on side …

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.

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 ...

Acoustic sensors with ultrahigh sensitivity, broadband response, and high resolution are essential for high-precision nondestructive weak signal detection technology. In this paper, based on the ...

physical parameters surrounding the WGM device [8], such as heat, pressure, and magnetic fields. Although this makes the mode shift technique incredibly versatile, it is also problematic as changes in ambient conditions (such as temperature, pressure, and humidity) tend to introduce unwanted drift in the mode shift signal.

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, …

WGM resonators can detect not only physical matter but also invisible stimuli such as electrical and magnetic fields, pressure and force, and temperature changes by …

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 ...

Whispering-gallery-mode (WGM) microbubble resonators are ideal optical sensors due to their high quality factor, small mode volume, high optical energy density, and geometry/design/structure (i.e., hollow microfluidic channels). When used in combination with microfluidic technologies, WGM microbubble resonators can be applied …

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).

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 ...

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Thus, when working with a high-quality WGM (quality factor ∼10 5) the asserted sensitivity for ambient overpressure is from 3.2 dB/kPa for gold membrane diameter D = 200 μm to 25 dB/MPa for D = 40 μm. In the absence of any information in the literature on analogues of the proposed sensor concept, it seems difficult for us to …

Therefore, pressure change can be measured with high sensitivity. In the work presented here, ethanol droplets embedded in a silicone matrix are considered. The shift of the resonance frequencies of microdroplets embedded in silicone as function of the applied pressure is investigated. ... (WGM) resonator properties as a thermometer could …

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

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

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

WGM sensors have been developed for multiplexed detection of clinically relevant biomolecules while also being adapted for the analysis of single-protein interactions. They have been used for the detection of materials in different phases and forms, including gases, liquids, and chemicals. Furthermore, WGM sensors have been …

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 …

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

Optical whispering-gallery mode (WGM) microresonators, confining resonant photons in a microscale volume for long periods of time, strongly enhance light-matter interactions, …

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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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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 …

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 …

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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 ...

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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We anal yzed the process of the self-injection locking of a diode laser to a high-Q WGM. microresonator and found simple analytical f ormulas for the width of the locking band and. the resulting ...

Above every square inch on the surface of the Earth is 14.7 pounds of air. That means air exerts 14.7 pounds per square inch (psi) of pressure at Earth's surface. High in the atmosphere, air pressure decreases. With fewer air molecules above, there is less pressure from the weight of the air above. Pressure varies from day to day at the Earth ...

(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 …