4/18/2018, a high-speed illuminator integrated into a silicon chip to support a new architecture for silicon-based optoelectronics. However, to date, since compound semiconductor-based illuminators are difficult to manufacture directly on silicon substrates, integration into silicon-based platforms faces significant challenges.
Recently, researchers from the Japan Science and Technology Bureau have developed high-speed, highly integrated graphene-based silicon-based chip emitters. These emitters operate in the near infrared region, including the telecommunications wavelength (about 1550 nm). The research team said that the new transmitter "has a greater advantage than traditional compound semiconductor emitters."
For the first time, the research team demonstrated graphene-based integration, high-speed on-chip blackbody emitters in the near-infrared region including telecom wavelengths. The emitter has a fast response time of approximately 100 ps, ​​which is approximately 105 times faster than previous graphene emitter response times, which have been demonstrated on single and small layers of graphene. The response time of the device depends on the number of graphene layers, which can be controlled by the contact of graphene with the substrate.
Based on the thermal model of the emitter including graphene and substrate, the researchers explained the working mechanism of the high-speed emitter by theoretical calculation of the heat conduction equation. The simulation results show that the fast response characteristics can be understood not only by the classical heat transfer of in-plane heat conduction in graphene and the heat dissipation to the substrate, but also by remote quantum heat transfer via surface polar phonons (SPoPh) .
In addition, this is the first real-time optical communication based on graphene-based illuminants, demonstrating the ability of graphene emitters as a new source of optical communication.
The researchers said: "We have created an integrated two-dimensional array emitter that grows large-scale graphene by chemical vapor deposition. The emitters work in air and have less space due to their planar device structure. , so the fiber can be directly coupled into the transmitter."
The researchers concluded: "We show real-time optical communication, a highly integrated two-dimensional array of emitters, a capped emitter that operates in air and can couple fibers directly to the emitter. The emitter can be used to achieve height integrated optoelectronic and silicon photonic transistors, small size, and speed transmitter open up new paths
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