Concentric silicon micro-ring resonators with enhanced transmission notch depth

• In this work, we have analyzed, fabricated and demonstrated concentric micro-ring resonators in silicon-on-insulator (SOI) structure for enhanced transmission notches. The operation principles of the concentric ring resonators are studied by time-domain coupled-mode theory. Directional coupling between concentric rings offers another freedom in designing deep notch optical filters and ultra-sensitive biosensors. The finite-difference-time-domain (FDTD) simulations have shown the improvement of the notch depth, evenly distributed mode field and the effect of the resonance shift. The device is demonstrated in silicon-on-insulator structure. Transmission notch depth improvement of ~ 15dB is demonstrated for the 21-20.02-μm-radius double-ring structure comparing with the single 21-μm-radius ring.

Ämnesord

NATURVETENSKAP  -- Fysik -- Annan fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Other Physics Topics (hsv//eng)

Nyckelord

Concentric micro-ring resonators

Silicon-on-insulator

Concentric rings

Coupled-mode theories

Directional couplings

Distributed modes

Enhanced transmissions

Finite difference time domains

Notch depths

Operation principles

Resonance shifts

Ring structures

Silicon-on-insulator structures

Time domains

Biosensors

Microsensors

Nonmetals

Optical filters

Optical resonators

Optoelectronic devices

Resonators

Time domain analysis

Notch filters

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