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Proceedings Paper

Mid-infrared electro-optic modulation in few-layer black phosphorus (Conference Presentation)
Author(s): Ruoming Peng; Kaveh Khaliji; Nathan Youngblood; Roberto Grassi ; Tony Low; Mo Li
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Paper Abstract

Black phosphorus stands out from the family of two-dimensional materials as a semiconductor with a direct, layer-dependent bandgap in energy corresponding to the spectral range from the visible to the mid-infrared (mid-IR), as well as many other attractive optoelectronic attributes. It is, therefore, a very promising material for various optoelectronic applications, particularly in the important mid-IR range. While mid-IR technology has been advancing rapidly, both photodetection and electro-optic modulation in the mid-IR rely on narrow-band compound semiconductors, which are difficult and expensive to integrate with the ubiquitous silicon photonics. For mid-IR photodetection, black phosphorus has been proven to be a viable alternative. Here, we demonstrate electro-optic modulation of mid-IR absorption in few-layer black phosphorus under field applied by an electrostatic gate. Our experimental and theoretical results find that, within the doping range obtainable in our samples, the quantum confined Franz-Keldysh effect is the dominant mechanism of electro-optic modulation. Spectroscopic study on samples with varying thickness reveals strong layer-dependence in the inter-band transition between different sub-bands. Our results show black phosphorus is a very promising material to realizing efficient mid-IR modulators.

Paper Details

Date Published: 14 March 2018
Proc. SPIE 10534, 2D Photonic Materials and Devices, 105340J (14 March 2018); doi: 10.1117/12.2294528
Show Author Affiliations
Ruoming Peng, Univ. of Minnesota, Twin Cities (United States)
Kaveh Khaliji, Univ. of Minnesota, Twin Cities (United States)
Nathan Youngblood, Univ. of Minnesota, Twin Cities (United States)
Roberto Grassi , Univ. of Minnesota, Twin Cities (United States)
Tony Low, Univ. of Minnesota, Twin Cities (United States)
Mo Li, Univ. of Minnesota, Twin Cities (United States)

Published in SPIE Proceedings Vol. 10534:
2D Photonic Materials and Devices
Arka Majumdar; Xiaodong Xu; Joshua R. Hendrickson, Editor(s)

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