Fabrication and spectral characterizations of high Q asymmetric resonant cavities

Tang, Jun; Liu, Jianhua; Shang, Chenglong; Xie, Chengfeng; Guo, Hao; Qian, Kun; Chen, Xue; Liu, Jun

doi:10.1016/j.optcom.2015.06.077

Cited by 3 publications

(1 citation statement)

References 25 publications

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“…Experiments were conducted using a droplet with an equatorial radius of approximately 370 ± 15 μm at 50% RH. Equation (3), where d 1 and d 2 are the minor and major axes of the elliptic sphere, was used to evaluate the eccentricity [ 30 ]: e = ( d 1 − d 2)/( d 1 + d 2) × 100%, …”

Section: Methodsmentioning

confidence: 99%

High-Sensitivity Whispering Gallery Mode Humidity Sensor Based on Glycerol Microdroplet Volumetric Expansion

Reinis

Milgrave

Draguns

et al. 2021

Sensors

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We demonstrate a highly sensitive whispering gallery mode (WGM) relative humidity (RH) sensor based on a glycerol microdroplet. WGMs were excited using a 760 nm tunable semiconductor laser. We used free space coupling, which is effective when using a liquid resonator. A detailed analysis of different parameters influencing the sensor’s characteristics (sensitivity, hysteresis, resolution, stability, and temperature) is presented. The sensitivity of the sensor is one of the highest reported (2.85 nm/% RH in the range 50–70% RH with the resolution 1 × 10−4% RH). This type of humidity sensor has several advantages, such as high sensitivity, extended lifetime, good repeatability, and low cost, as well as the use of a non-toxic and environmentally friendly liquid.

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Section: Methodsmentioning

confidence: 99%

High-Sensitivity Whispering Gallery Mode Humidity Sensor Based on Glycerol Microdroplet Volumetric Expansion

Reinis

Milgrave

Draguns

et al. 2021

Sensors

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Whispering gallery resonators with broken axial symmetry: Theory and experiment

Fürst¹,

Sturman²,

Buse³

et al. 2016

Opt. Express

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Axial symmetry is the cornerstone for theory and applications of high-Q optical whispering gallery resonators (WGRs). Nevertheless, research on birefringent crystalline material persistently pushes towards breaking this symmetry. We show theoretically and experimentally that the effect of broken axial symmetry, caused by optical anisotropy, is modest for the resonant frequencies and Q-factors of the WGR modes. Thus, the most important equatorial whispering gallery modes can be quantitatively described and experimentally identified. At the same time, the effect of broken axial symmetry on the light field distribution of the whispering gallery modes is typically very strong. This qualitatively modifies the phase-matching for the χ⁽²⁾ nonlinear processes and enables broad-band second harmonic generation and optical parametric oscillation. The effect of weak geometric ellipticity in nominally symmetric WGRs is also considered. Altogether our findings pave the way for an extensive use of numerous birefringent (uniaxial and biaxial) crystals with broad transparency window and large χ⁽²⁾ coefficients in nonlinear optics with WGRs.

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Wavelength Sensing Based on Whispering Gallery Mode Mapping

Berkis

Reinis

Milgrave

et al. 2022

Fibers

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We demonstrate a wavelength sensor based on whispering gallery mode (WGM) resonators. For the first time, multiple polymethyl methacrylate (PMMA) microspheres were simultaneously attached to a tapered fiber. WGM resonances from these commercially available PMMA microspheres were observed with a NIR camera, monitoring the scattered light. Circulating light in the WGMs was scattered on the outer layer of the microspheres and appeared as bright spots due to scattering defects. For each laser wavelength fed into the tapered fiber, the light interfered differently for the various sizes of PMMA microspheres. We measured scattered light intensity for different wavelengths and created a barcode for each microsphere. Combining these barcodes into a mode map allowed for unknown wavelength detection. A tunable laser around 1550 nm was used for measurements. As a result, a laser wavelength sensor system with a detection limit of 5 pm was demonstrated. The principles of increasing selectivity, as well as creating a compact device, were discussed.

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Fabrication and spectral characterizations of high Q asymmetric resonant cavities

Cited by 3 publications

References 25 publications

High-Sensitivity Whispering Gallery Mode Humidity Sensor Based on Glycerol Microdroplet Volumetric Expansion

High-Sensitivity Whispering Gallery Mode Humidity Sensor Based on Glycerol Microdroplet Volumetric Expansion

Whispering gallery resonators with broken axial symmetry: Theory and experiment

Wavelength Sensing Based on Whispering Gallery Mode Mapping

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