All-silicon polarized light source based on electrically excited whispering gallery modes in inversely tapered photonic resonators
As a result of its indirect bandgap, emitting photons from silicon in an efficient way remains challenging. Silicon light emitters that can be integrated seamlessly on a CMOS platform have been demonstrated; however, none satisfies an ensemble of key requirements such as a small footprint, room-temp...
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Veröffentlicht in: | APL materials 2020-06, Vol.8 (6), p.061110-061110-8, Article 061110 |
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creator | Schmitt, Sebastian W. Schwarzburg, Klaus Sarau, George Christiansen, Silke H. Wiesner, Sven Dubourdieu, Catherine |
description | As a result of its indirect bandgap, emitting photons from silicon in an efficient way remains challenging. Silicon light emitters that can be integrated seamlessly on a CMOS platform have been demonstrated; however, none satisfies an ensemble of key requirements such as a small footprint, room-temperature operation at low voltages, and emission of narrow and polarized lines with a high spectral power density in the near-infrared range. Here, we present an all-silicon electrically driven light emitting diode that consists of an inversely tapered half-ellipsoidal silicon photonic resonator containing a p–n junction used to excite whispering gallery modes (WGMs) inside the resonator. Under low voltage operation at room temperature, such a photonic silicon light-emitting diode exhibits a band-edge emission (900–1300 nm) with a wall-plug efficiency of 10−4. The emitted spectrum is amplified in multiple WGMs and shows peaks that are polarized and have linewidths Δλ as narrow as 0.33 nm and spectral power densities as high as 8 mW cm−2 nm−1. Considering its small footprint of ∼1 µm and remarkable emission characteristics, this silicon light source constitutes a significant step ahead toward fully integrated on-chip silicon photonics. |
doi_str_mv | 10.1063/5.0007759 |
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title | All-silicon polarized light source based on electrically excited whispering gallery modes in inversely tapered photonic resonators |
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