We report on the coupling of whispering gallery modes in a 500-?m-radius silicon microsphere to a femtosecond-laser-inscribed glass optical waveguide. The shallow glass waveguide with a large mode field diameter in the near-infrared is written at a depth of 25 ?m below the glass surface, resulting in a high excitation impact parameter of 525 ?m for the microsphere. The excited whispering gallery modes of the silicon microsphere have quality factors of approximately 105 in the 90° elastic scattering and 0° transmission. Integration of such spherical silicon microresonators on femtosecond-laser-inscribed glass waveguides is promising for photonic communication, computation, and sensing applications.
Silicon microsphere whispering gallery modes excited by femtosecond-laser-inscribed glass waveguides
Ramponi;Roberta;Eaton;Shane Michael
2018
Abstract
We report on the coupling of whispering gallery modes in a 500-?m-radius silicon microsphere to a femtosecond-laser-inscribed glass optical waveguide. The shallow glass waveguide with a large mode field diameter in the near-infrared is written at a depth of 25 ?m below the glass surface, resulting in a high excitation impact parameter of 525 ?m for the microsphere. The excited whispering gallery modes of the silicon microsphere have quality factors of approximately 105 in the 90° elastic scattering and 0° transmission. Integration of such spherical silicon microresonators on femtosecond-laser-inscribed glass waveguides is promising for photonic communication, computation, and sensing applications.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
