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Peer-reviewedCC BY 4.0Polymers

A Polymeric Platform for Whispering Gallery Modes Silica Microresonators Coupling

  • Gianluca Persichetti1
  • Vito Coviello1
  • Daniele Farnesi2
  • Gabriele Frigenti2
  • Stefano Pelli2
  • Genni Testa1
  • Gualtiero Nunzi Conti2
  • Romeo Bernini1
  1. 1Institute for Electromagnetic Sensing of the Environment (IREA), National Research Council of Italy (CNR), 80124 Napoli, Italy
  2. 2Institute of Applied Physics “Nello Carrara” (IFAC), National Research Council of Italy (CNR), 50019 Sesto Fiorentino, Italy
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Abstract

A polymeric platform for high-performance coupling to whispering gallery modes of silica microresonators is proposed and validated. The system is based on a low-refractive-index ridge waveguide fabricated with widely used SU8 and PDMS optical polymers. The waveguide is integrated with grating couplers for a simple fiber-to-chip connection. The coupling capabilities of the proposed platform were characterized using microsphere and microbubble resonators of different sizes. The experimental results demonstrate coupling efficiency in excess of 99% with microsphere and microbubble resonators having intrinsic quality factors in excess of 107 and 106, respectively. This performance is comparable with conventional fiber taper couplers and enables simple on-chip packaging of silica microresonators.

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Cite

BibTeXRIS
BibTeX
@article{persichetti2026polymeric,
  title = {{A Polymeric Platform for Whispering Gallery Modes Silica Microresonators Coupling}},
  author = {Gianluca Persichetti and Vito Coviello and Daniele Farnesi and Gabriele Frigenti and Stefano Pelli and Genni Testa and Gualtiero Nunzi Conti and Romeo Bernini},
  journal = {Polymers},
  year = {2026},
  month = oct,
  doi = {10.3390/polym18202581},
  url = {https://www.mdpi.com/2073-4360/18/20/2581},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - A Polymeric Platform for Whispering Gallery Modes Silica Microresonators Coupling
AU  - Gianluca Persichetti
AU  - Vito Coviello
AU  - Daniele Farnesi
AU  - Gabriele Frigenti
AU  - Stefano Pelli
AU  - Genni Testa
AU  - Gualtiero Nunzi Conti
AU  - Romeo Bernini
PY  - 2026
DA  - 2026/10/20
JO  - Polymers
DO  - 10.3390/polym18202581
UR  - https://www.mdpi.com/2073-4360/18/20/2581
AB  - A polymeric platform for high-performance coupling to whispering gallery modes of silica microresonators is proposed and validated. The system is based on a low-refractive-index ridge waveguide fabricated with widely used SU8 and PDMS optical polymers. The waveguide is integrated with grating couplers for a simple fiber-to-chip connection. The coupling capabilities of the proposed platform were characterized using microsphere and microbubble resonators of different sizes. The experimental results demonstrate coupling efficiency in excess of 99% with microsphere and microbubble resonators having intrinsic quality factors in excess of 107 and 106, respectively. This performance is comparable with conventional fiber taper couplers and enables simple on-chip packaging of silica microresonators.
SN  - 2073-4360
ER  -