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28 March 2024
 
  » arxiv » 1511.3348

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Multilayer black phosphorus as a versatile mid-infrared electro-optic material
Charles Lin ; Roberto Grassi ; Tony Low ; Amr S. Helmy ;
Date Wed, 11 Nov 2015 01:06:07 GMT (1806kb,D)
AbstractWe investigate the electro-optic properties of black phosphorus (BP) thin films for optical modulation in the mid-infrared frequencies. Our calculation indicates that an applied out-of-plane electric field may lead to red-, blue-, or bidirectional shift in BP’s absorption edge. This is due to the interplay between the field-induced quantum-confined Franz-Keldysh effect and the Pauli-blocked Burstein-Moss shift. The relative contribution of the two electro-absorption mechanisms depends on doping range, operating wavelength, and BP film thickness. For proof-of concept, simple modulator configuration with BP overlaid over a silicon nanowire is studied. Simulation result shows that operating BP in the quantum-confined Franz-Keldysh regime can enable improved maximal attainable absorption as well as power efficiency compared to its graphene counterpart.
Source arXiv, 1511.3348
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