journal article
Jul 01, 2024
Tailoring epsilon-near-zero wavelength and nonlinear absorption properties of CdO thin films by Mo doping
Abstract
Cadmium oxide (CdO) has recently attracted attention as a material with controllable properties tailored for optoelectronic and nanophotonic devices due to its superior mobility. However, its potential application in near-infrared (NIR) remains to be explored. In this work, we demonstrate that the epsilon-near-zero (ENZ) wavelength and nonlinear optical properties of CdO films can be effectively tuned by Mo doping. The results show that Mo doping increases the electron concentration as well as improve the crystalline quality of CdO. With increasing Mo doping, we achieve blueshifts of the ENZ wavelength from 2.89 to 1.56 μm. The nonlinear absorption (NLA) behavior at 1550 nm changes from reverse saturable absorption to saturable absorption with increasing Mo content. Moreover, significant improvement in NLA performance with nonlinear absorption coefficient β = −72 cm/GW is observed at the highest doping content. Our work shows that doped CdO films with tunable optoelectrical and nonlinear optical properties can be an ideal candidate for optoelectronic and nanophotonic application in the NIR region.
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Details
- Published
- Jul 01, 2024
- Vol/Issue
- 125(1)
Authors
Funding
the Cooperation project with Hong Kong, Macao and Taiwan supported by Science and Technology Commission of Shanghai Municipality
Award: 22220760300
CityU SGP project
Award: 9380076
the CAS Special Research Assistant Project and Key foreign cooperation projects of Bureau of International Cooperation of Chinese Academy of Science
Award: 181231KYSB20210001
Cite This Article
Yi Wu, Ying Wang, Mengxia Wang, et al. (2024). Tailoring epsilon-near-zero wavelength and nonlinear absorption properties of CdO thin films by Mo doping. Applied Physics Letters, 125(1). https://doi.org/10.1063/5.0205808
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