Whispering gallery microsensors: a review
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.
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Review of Microbottle Resonators for Sensing Applications
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 …
Schematic of WGM pressure sensor system and block
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).
Coupled Optical Resonances in a Dielectric Microsphere
(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 …
Improving the sensitivity of WGM pressure sensors with …
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.
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Microtubule WGM Sensor: Applications and Key …
Capillary microcavity Whispering gallery mode (WGM) resonators with high Q and small mode volume are well suited for applications in high sensitivity sensing. …
All-optical tuning of the frequency of Yb3+/Er3+ co
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 …
Whispering-Gallery Sensors: Matter
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 …
The Highs and Lows of Air Pressure | Center for Science …
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Whispering-Gallery Sensors
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 …
Whispering-Gallery Sensors
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 …
Whispering Gallery-Mode Microdroplet Tensiometry
The extremely high precision in combination with a 0.5 μm-wide microcapillary opening allows us to carry out measurements on very small droplets, …
Whispering Gallery Mode Optical Microresonators: …
Abstract. Whispering gallery mode resonators (WGMRs) have achieved significant results due to their unique properties such as extremely small mode volume, …
Improving the sensitivity of WGM pressure sensors with …
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 ...
Linear Laser Tuning Using a Pressure-Sensitive …
dimensions of the bubble the sensitivity of the WGM to input pressure was calculated as 61:4 GHz/MPa [18]. With 0.6 MPa gauge pressure, the frequency of the WGM can be tuned by 34.8 GHz, which is the maximum ne TP)HHGEDFNWRO DVHU:0 6$ QPODVHU /RFN,QDPSOLILHU)LEHUFRXSOHGPLFUREXEEOHF DYLW 30 3UHVVXUHL Q …
Highly-twisted states of light from a high quality factor
Principle Idea. OAM ejection from a WGM is well-understood at a qualitative level, based on the basic angular momentum conservation criterion between the initial WGM with angular momentum m, the ...
Experimental setup of the whispering-gallery …
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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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 ...
Whispering-gallery-mode sensors for biological and …
WGM resonators are miniature micro-interferometers that use the multiple-cavity passes of light for very sensitive measurements at the microscale and nanoscale, …
Recent progress of in-fiber WGM microsphere …
In-fiber whispering gallery mode (WGM) microsphere resonators have received remarkable attention due to the superiorities of compact structure, high stability …
Optical Whispering-Gallery-Mode Microbubble Sensors
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 …
Tunable Whispering Gallery Mode Photonic Device …
We propose and experimentally demonstrate the first tunable whispering gallery mode (WGM) photonic device based on side …
Wireless whispering-gallery-mode sensor for …
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 ...
A high-sensitivity optical fiber relative humidity sensor …
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, …
Q-factor modification of LN based WGM resonator
WGM resonators were annealed at high temperature(1050 °C) to improve the Q-factor, and measured the side roughness of the WGM resonator before and after annealing with a white light interference microscope. It found that Q-factor of WGM resonator can be increased by more than 2 orders of magnitude by thermal treatment at …
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High-Q whispering gallery modes in a polymer …
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.