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Micro-ring resonators in mid-IR
Junchao Zhou PHYS 689
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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
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On resonance: Critical coupling when 𝛼=|t|, 𝑃 𝑡1 =0
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Ring resonators parameters:
FSR FWHM Finess: 𝑟=148𝜇𝑚 Quality factor:
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Several configurations:
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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
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On resonance:
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r1 = 100 µm r2 = 110 µm r1 = 100 µm r2 = µm
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Device fabrication:
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