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• W2236354002 abstract "Since the invention of the laser, stimulated emission has been the de facto king of optical communication. Lasers can be directly modulated at rates as high as 50GHz, much faster than a typical solid state light-emitting diode (LED) that is limited by spontaneous emission to 50% efficiency.I start by formulating an optical antenna circuit model whose elements are based completely off of antenna geometry. This allows for intuitive antenna design and suggests that rate enhancements up to ~3,000x are possible while keeping antenna efficiency >50%. Such a massive speed-up in spontaneous emission would enable an LED that can be directly modulated at 100’s of GHz, much faster than any laser.I then use the circuit model to design an arch-dipole antenna, a dipole antenna with an inductive arch across the feedgap. I experimentally demonstrate a free-standing arch-dipole based nanoLED with rate enhancement of 115x and 66% antenna efficiency. Because the emitter is InGaAsP, a common III-V material, I experimentally show that this device can be easily and efficiently coupled into an InP waveguide. Experimental coupling efficiencies up to 70% are demonstrated and directional antennas are employed that offer front to back emission ratios of 3:1.Finally, I show that a nanoLED can still have high quantum yield by using a transition metal dichalcogenide, WSe2, as the emitter material. By coupling a monolayer of WSe2 to a cavity-backed slot antenna, I demonstrate a record rate enhancement for a solid state emitter of 320x. In addition, the nanoscale devices (30nm x 250nm) have a quantum yield comparable to an unprocessed WSe2 monolayer. Such a fast, efficient, nano-emitter not only has the ability to reduce power consumption in central processing units (CPUs) by orders of magnitude but may also revolutionize integrated sensing and imaging applications at the nanoscale." @default.
• W2236354002 created "2016-06-24" @default.
• W2236354002 creator A5013573136 @default.
• W2236354002 date "2015-01-01" @default.
• W2236354002 modified "2023-09-26" @default.
• W2236354002 title "Metal Optics Based nanoLEDs: In Search of a Fast, Efficient, Nanoscale Light Emitter" @default.
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