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Coupling light to whispering gallery mode resonators (Contributo in atti di convegno)

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Coupling light to whispering gallery mode resonators (Contributo in atti di convegno) (literal)

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Farnesi D.; Righini G.C.; Barucci A.; Berneschi S.; Chiavaioli F.; Cosi F.; Pelli S.; Soria S.; Trono C.; Ristic D.; Ferrari M.; Nunzi Conti G. (2014)
Coupling light to whispering gallery mode resonators
in SPIE Photonics Europe Silicon Photonics and Photonic Integrated Circuits IV, Brussels-Belgium, 14 - 17 April 2014
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Farnesi D.; Righini G.C.; Barucci A.; Berneschi S.; Chiavaioli F.; Cosi F.; Pelli S.; Soria S.; Trono C.; Ristic D.; Ferrari M.; Nunzi Conti G. (literal)

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Centro Studi e Ricerche Enrico Fermi, Piazza del Viminale 2, 00184 Rome, Italy; Istituto di Fisica Applicata N. Carrara, CNR-IFAC, MiPLab, Via Madonna del Piano 10, 50019 Sesto Fiorentino (FI), Italy; Institut Ruder Bo?kovi?, Bijeni?ka cesta 54, 10000 Zagreb, Croatia; Istituto di Fotonica e Nanotecnologie, CNR-IFN, CSMFO Lab, Via alla Cascata 56/C, Povo, 38123 Trento, Italy (literal)

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Abstract

Full exploitation of the unique properties of high quality factor micro-optical Whispering Gallery Mode (WGM) resonators requires a controllable and robust coupling of the light to the cavity, either for fundamental investigations or even more for practical applications. Fiber tapers are ideal phase-and-mode-matched couplers and are typically used for lab demonstrations in silica based micro-resonators or in low-index crystalline disks. Prism-based coupling basically adapts to any material and offers improved robustness and reliability for the implementation of devices based on larger resonators. We present the results of our studies on alternative methods based on integrated waveguides with specific reference to the coupling to lithium niobate disk resonators. We also demonstrate efficient coupling from fiber tapers to higher order azimuthal modes in coated microspheres and for third harmonic generation in silica microspheres. We finally propose a new method based on fiber gratings for improved robustness in biosensing applications. © 2014 SPIE. (literal)

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