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Silicon optical diode based on cascaded photonic crystal cavities
Optics Letters
|April 3, 2014
Summary
Researchers developed an all-silicon optical diode using photonic crystal cavities. This device demonstrates nonreciprocal transmission, crucial for advanced optical circuits.
Area of Science:
- Photonics
- Optical Engineering
- Materials Science
Background:
- Optical diodes are essential for controlling light direction in integrated photonic circuits.
- Existing optical diode technologies often face limitations in terms of size, material compatibility, or performance.
Purpose of the Study:
- To propose and demonstrate an all-silicon passive optical diode.
- To leverage optical nonlinearity in cascaded photonic crystal (PhC) L3 cavities for nonreciprocal light transmission.
Main Methods:
- Fabrication of an all-silicon device utilizing cascaded PhC L3 cavities.
- Characterization of the device's transmission properties, including nonreciprocal transmission ratio (NTR) and insertion loss.
- Development of a nonlinear coupled mode model for theoretical analysis and simulation.
Main Results:
- Achieved a nonreciprocal transmission ratio (NTR) of 30.8 dB.
- Realized an insertion loss of 8.3 dB.
- Demonstrated a broad 17 dB operation bandwidth of 0.08 nm and stable NTR (>16 dB) over a range of input powers (-6.25 to -2.95 dBm).
Conclusions:
- The proposed all-silicon optical diode effectively utilizes optical nonlinearity in cascaded PhC L3 cavities.
- The device exhibits high performance metrics, including significant NTR and operational bandwidth.
- Numerical simulations based on the developed model accurately predict experimental results, validating the device design and analysis approach.
