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Width Dependent Two-Photon Absorption in Monolayer Black Phosphorus Nanoribbons

1
School of Physics and Electronic Information, Yunnan Normal University, Kunming 650500, China
2
Yunnan Key Laboratory of Opto-electronic Information Technology, Yunnan Normal University, Kunming 650500, China
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(10), 2014; https://doi.org/10.3390/app9102014
Received: 9 April 2019 / Revised: 6 May 2019 / Accepted: 9 May 2019 / Published: 16 May 2019
(This article belongs to the Special Issue Optical Properties of Novel Semiconductor Nanostructures)
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Abstract

Black phosphorus nanoribbons (BPNs) might offer alternatives to narrow-gap compound semiconductors for tunable optoelectronics in infrared region. In this work we present a quantum perturbation theory on two-photon absorption (TPA) in monolayer armchair-edged black phosphorus nanoribbons (acBPNs) employing the reduced two-band model within the long-wavelength BP Hamiltonian. The matrix elements for one-photon transition have been derived and the TPA spectrum associate with intra conduction band transition and inter band transition have been drawn. The calculations predict that the TPA coefficient in acBPNs is in the magnitude of 10−6 m/W in visible region, which is 4 orders higher than the conventional semiconductor quantum dots. And in infrared region, there is a giant TPA coefficient, which is mainly contributed from intra band transitions and can reach up to10−1 m/W. The TPA peaks can be tuned both by the width of BPNs and the electron relaxation energy. View Full-Text
Keywords: two-photon absorption; black phosphorus; nonlinear optics two-photon absorption; black phosphorus; nonlinear optics
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Liu, Y.; Feng, X.; Qin, Y.; Wang, Q. Width Dependent Two-Photon Absorption in Monolayer Black Phosphorus Nanoribbons. Appl. Sci. 2019, 9, 2014.

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