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We demonstrate novel cyan light-emitting-diodes (LEDs) on patterned-sapphire substrate with record-high electrical-to-optical bandwidth (0.38 GHz) among visible LEDs. 0.93Gbps error-free transmission in plastic-optical-fiber can be achieved by using such device under only 20mA bias current.
Electrical-optical pump-probe is used to investigate GaN blue LEDs under different temperatures. Measurement result indicates that under moderate current density (∼200A/cm2) piezoelectric field induced carrier-escaping cannot be neglected and is responsible for the observed efficiency-droop.
The lack of simple but reliable microvalves is still a serious problem for many lab-on-a-chip applications. This work studied the use of blood coagulation, the transformation of liquid blood into solid coagulum, as a possible valving mechanism for microfluidic control and demonstrated a one-time open-to-close valve. This is done by creating a solidified blood coagulum, which clogs a normally-open...
By using oxide-relief technique, a high modulation-efficiency (9.8GHz/mA1/2) and a high modulation-speed (34 Gbps) with a record-high data-rate/power-dissipation ratios (2.9 (9.2) Gbps/mW at 34 (12.5) Gbps) of 850nm VCSELs have been demonstrated.
We demonstrate a high-performance Zn-diffusion 850-nm vertical-cavity surface-emitting laser (VCSEL). By the use of strained InAlGaAs/AlGaAs multiple quantum wells for the active region, our structure can have a much higher maximum output power, higher differential quantum efficiency (DQE), and larger modulation current efficiency (D-factor) than those of non-strained control GaAs/AlGaAs VCSELs. Two...
We demonstrate cascade green light-emitting-diodes, which greatly release trade-off between output-power and speed and exhibits strong modulation-speed enhancement with negligible output-power degradation from room-temperature to 200??C operation. 200 Mbit/sec error-free transmission at 200??C can be achieved.
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