Whispering gallery modes in a liquid-filled hollow glass microsphere

Jiang

Advanced Photonics Research

et al. 2022

High‐resolution temperature measurement is nerve‐wracking obstruction for precise characterization of many physical, chemical, and biological processes. To solve this problem, a novel microcavity–optomechanical–oscillation‐based thermometer is proposed. The microcavity serving as a link parametrically couples the mechanical resonator and optical resonator in the same structure and provides a natural and highly sensitive temperature transduction mechanism and ultrahigh‐resolution optical demodulation. The mathematical model of geometrical parameters, mechanics, and material properties for temperature response mechanism is established and verified experimentally. The proposed thermometer has a thermal sensitivity of 11 300 Hz °C−1 and an ultrahigh‐temperature resolution of 1 × 10−4 °C, to the best of one's knowledge, which is the highest temperature resolution with a silica cavity.

“…Ref. [25] area of copper sheet/microtube (shown in Figure 1a). E cu ¼ 120 GPa,α cu ¼ 16.5 ppm °CÀ1 .…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ultrahigh‐Resolution Optical Fiber Thermometer Based on Microcavity Opto‐Mechanical Oscillation

Jiang

Advanced Photonics Research

et al. 2022

“…[ 45 ] The whispering gallery mode (WGM) resonance properties inside the liquid‐filled hollow glass microsphere with different refractive index and diameter less than wavelength were studied in Ref. [46]. Retsch et al.…”

Section: Introductionmentioning

confidence: 99%

“…[45] The whispering gallery mode (WGM) resonance properties inside the liquid-filled hollow glass microsphere with different refractive index and diameter less than wavelength were studied in Ref. [46]. Retsch et al studied the hollow silica spheres with extremely thin low refractive index shells, where the efficiency of Mie resonance is maximized due to significantly reduced multiple scattering while lengthens the mean free path of light inside the sphere.…”

Section: Introductionmentioning

confidence: 99%

Optical Super‐Resonances in Mesoscale Dielectric Cenosphere: Giant Magnetic Field Generations

Minin,

Zhou,

Minin

2023

Annalen der Physik

Resonant light scattering by mesoscale dielectric spheres has received enormous attention and found many interesting applications. The recently emerged field of Mesotronics provides novel opportunities for wavelength‐scaled optics and new fundamental aspects are still being uncovered. It has recently been demonstrated that high‐order Mie resonances can be excited in homogeneous low‐dissipation mesoscale dielectric spheres, leading to the generation of intense magnetic fields. This article describes a simple and effective way to drastically enhance the superresonance effect. Proof‐of‐principle results for the first time show that yet one more novel phenomenon of increasing the intensity of the magnetic field without changing the resonant Mie size parameter of the sphere by introducing an air cavity. In such a dielectric cenosphere (from two Greek words “kenos”‐hollow and “sphaira”‐sphere), by correct choice of the air cavity size, it is possible to increase the intensity of the electromagnetic fields at the poles of the sphere by an order of magnitude due to increasing of the amplitude of resonant partial wave coefficient.

“…Due to the large TOC, the liquid resonators exhibit a high resolution for thermal sensing. A mounting number of designs of liquid resonators was proposed and developed for different applications in recent years [ 24 , 25 , 26 ]. However, there are several disadvantages which prevent the practical utilization of liquid droplets.…”

Section: Introductionmentioning

confidence: 99%

Packaged Droplet Microresonator for Thermal Sensing with High Sensitivity

Chen

et al. 2018

Sensors

Liquid droplet and quasi-droplet whispering gallery mode (WGM) microcavities have been widely studied recently for the enhanced spatial overlap between the liquid and WGM field, especially in sensing applications. However, the fragile cavity structure and the evaporation of liquid limit its practical applications. Here, stable, packaged, quasi-droplet and droplet microcavities are proposed and fabricated for thermal sensing with high sensitivity. The sensitivity and electromagnetic field intensity distribution are analyzed by Mie theory, and a quantified definition of the quasi-droplet is presented for the first time to the best of our knowledge. By doping dye material directly into the liquid, lasing packaged droplet and quasi-droplet microcavity sensors with a high thermal sensitivity of up to 205.3 pm/°C are experimentally demonstrated. The high sensitivity, facile fabrication, and mechanically robust properties of the optofluidic, packaged droplet microresonator make it a promising candidate for future integrated photonic devices.