Invited speaker: Sources for optical and infrared radiation are traditionally based on transitions between discrete electronic states and are therefore limited by the intrinsic emission properties of the semi-conductor or organic gain medium. Electron tunneling across narrow gaps may induce broadband photon emission due to inelastic transport through a tunneling junction; however, this process suffers from a very low efficiency, typically one photon per 10^5 electrons. Electrically-driven optical antennas could boost this quantum efficiency owing to concentrating photons and electrons within an ultrasmall volume. In my talk, I propose a new class of nanoscopic light sources that are not limited by quantum states, but rather depend on the antenna architecture and the applied bias. These compact light sources, based on electrically-driven nanogap optical antennas, feature a tunable emission wavelength, a high quantum efficiency, and operate at room temperature. As the fluctuations in the tunneling current constitute a broadband source, the electroluminescence can be tuned from the blue to the infrared spectral regions, by changing the antenna dimensions and the applied bias voltage. This implies that differently tuned devices can be integrated on-chip in close proximity on top of a wide variety of substrates or within microfluidic channels. Such multi-spectral sources have the potential to impact today’s Si-based electronic chips by employing fast light pulses as the communication path for higher data flux.
Claire Deeb, "Electrically-driven optical antennas for novel light-emission processes (Conference Presentation)," Proc. SPIE 10540, Quantum Sensing and Nano Electronics and Photonics XV, 105400Y (Presented at SPIE OPTO: January 30, 2018; Published: 14 March 2018); https://doi.org/10.1117/12.2289570.5751530977001.
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