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Germanium Nanosheets with Dirac Characteristics as a Saturable Absorber for Ultrafast Pulse Generation

Germanium Nanosheets with Dirac Characteristics as a Saturable Absorber for Ultrafast Pulse... Bulk germanium as a group‐IV photonic material has been widely studied due to its relatively large refractive index and broadband and low propagation loss from near‐infrared to mid‐infrared. Inspired by the research of graphene, the 2D counterpart of bulk germanium, germanene, has been discovered and the characteristics of Dirac electrons have been observed. However, the optical properties of germanene still remain elusive. In this work, several layers of germanene are prepared with Dirac electronic characteristics and its morphology, band structure, carrier dynamics, and nonlinear optical properties are systematically investigated. It is surprisingly found that germanene has a fast carrier‐relaxation time comparable to that of graphene and a relatively large nonlinear absorption coefficient, which is an order of magnitude higher than that of graphene in the near‐infrared wavelength range. Based on these findings, germanene is applied as a new saturable absorber to construct an ultrafast mode‐locked laser, and sub‐picosecond pulse generation in the telecommunication band is realized. The results suggest that germanene can be used as a new type of group‐IV material for various nonlinear optics and photonic applications. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Advanced Materials Wiley

Germanium Nanosheets with Dirac Characteristics as a Saturable Absorber for Ultrafast Pulse Generation

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Publisher
Wiley
Copyright
© 2021 Wiley‐VCH GmbH
ISSN
0935-9648
eISSN
1521-4095
DOI
10.1002/adma.202101042
Publisher site
See Article on Publisher Site

Abstract

Bulk germanium as a group‐IV photonic material has been widely studied due to its relatively large refractive index and broadband and low propagation loss from near‐infrared to mid‐infrared. Inspired by the research of graphene, the 2D counterpart of bulk germanium, germanene, has been discovered and the characteristics of Dirac electrons have been observed. However, the optical properties of germanene still remain elusive. In this work, several layers of germanene are prepared with Dirac electronic characteristics and its morphology, band structure, carrier dynamics, and nonlinear optical properties are systematically investigated. It is surprisingly found that germanene has a fast carrier‐relaxation time comparable to that of graphene and a relatively large nonlinear absorption coefficient, which is an order of magnitude higher than that of graphene in the near‐infrared wavelength range. Based on these findings, germanene is applied as a new saturable absorber to construct an ultrafast mode‐locked laser, and sub‐picosecond pulse generation in the telecommunication band is realized. The results suggest that germanene can be used as a new type of group‐IV material for various nonlinear optics and photonic applications.

Journal

Advanced MaterialsWiley

Published: Aug 1, 2021

Keywords: ; ; ;

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