Micro-ring resonators in mid-IR

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Presentation transcript:

Micro-ring resonators in mid-IR Junchao Zhou PHYS 689

Review of some basic concepts of micro-ring resonators Coupling Region 1 Coupling Region 𝛼: Loss coefficient of the ring; 𝜃=𝜔𝐿/𝑐 Gap distance Coupling length Refractive index

On resonance: Critical coupling when 𝛼=|t|, 𝑃 𝑡1 =0

Ring resonators parameters: FSR FWHM Finess: 𝑟=148𝜇𝑚 Quality factor:

Several configurations:

Micro-ring resonators in mid-IR Application Wavelength filter for sensors, biomedical sensing Optical communication Common materials for mid-IR waveguides Si Ge Si3N4 AlN Al2O3 Chalcogenide

On resonance:

r1 = 100 µm r2 = 110 µm r1 = 100 µm r2 = 102.5 µm

Device fabrication: