Passive and Active Whispering Gallery Mode Microresonators in Optical Engineering

摘要

The paper illustrates both review and original simulation results obtained via the modelling of different set-ups based onoptical microresonators for applications in optical sensing, lasing and spectroscopy. Passive microbubbles andmicrospheres coupled via long period fiber gratings (LPGs) and tapered fibers are designed and/or constructed for sensingof biological fluids in the near infrared (NIR) wavelength range. Rare earth doped chalcogenide glass integrated microdisksare designed for active sensing in the medium infrared (MIR) wavelength range. A home-made numerical codemodelling the optical coupling and the active behavior via rate equations of ion population is employed for a realisticdesign, by taking into account the most important active phenomena in rare earths, such as the absorption rates, thestimulated emission rates, the amplified spontaneous emission, the lifetime and branching ratios, the ion-ion energytransfers and the excited state absorption. Optical coupling is obtained by employing ridge waveguides, for micro-disks,and tapered fibers, for microspheres and microbubbles. Different dopant rare earths as Erbium (Er~(3+)) and Praseodymium(Pr~(3+)) are considered.