Tag: Photonic and Optical Devices
Semiconductor grafting enables GaAs/GeSn-MQW/Ge photodiode integration
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What the study found A lattice-mismatched GaAs/GeSn-multi-quantum well (MQW)/Ge n-i-p heterojunction photodiode was realized using semiconductor grafting. The device showed a record-low dark current density, broad spectral response, and high photoresponsivity. Why the authors say this matters The authors conclude that this grafting approach provides a way to build optoelectronic heterojunctions without the usual strict…
Photonic chip synthesizes flexible millimeter-wave signals
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What the study found The study found that a silicon photonic chip paired with a reconfigurable optical frequency comb can synthesize millimeter-wave signals. The system supports on-chip filtering and modulation and can produce single-frequency, multi-frequency, and vector signals for arbitrary IQ signal construction. Why the authors say this matters The authors say photonics-assisted millimeter-wave and…