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Ahmed S, Gan Y, Saleque AM, Wu H, Qiao J, Ivan MNAS, Hani SU, Alam TI, Wen Q, Tsang YH. 2D Semi-Metallic Hafnium Ditelluride: A Novel Nonlinear Optical Material for Ultrafast and Ultranarrow Photonics Applications. Small Methods 2024; 8:e2300239. [PMID: 37356086 DOI: 10.1002/smtd.202300239] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2023] [Revised: 05/23/2023] [Indexed: 06/27/2023]
Abstract
2D semi-metallic hafnium ditelluride material is used in several applications such as solar steam generation, gas sensing, and catalysis owing to its strong near-infrared absorbance, high sensitivity, and distinctive electronic structure. The zero-bandgap characteristics, along with the thermal and dynamic stability of 2D-HfTe2, make it a desirable choice for developing long-wavelength-range photonics devices. Herein, the HfTe2 -nanosheets are prepared using the liquid-phase exfoliation method, and their superior nonlinear optical properties are demonstrated by the obtained modulation depth of 11.9% (800 nm) and 6.35% (1560 nm), respectively. In addition, the observed transition from saturable to reverse saturable absorption indicates adaptability of the prepared material in nonlinear optics. By utilizing a side polished fiber-based HfTe2 -saturable absorber (SA) inside an Er-doped fiber laser cavity, a mode-locked laser with 724 fs pulse width and 56.63 dB signal-to-noise ratio (SNR) is realized for the first time. The generated laser with this SA has the second lowest mode-locking pump threshold (18.35 mW), among the other 2D material based-SAs, thus paving the way for future laser development with improved efficiency and reduced thermal impact. Finally, employing this HfTe2 -SA, a highly stable single-frequency fiber laser (SNR ≈ 74.56 dB; linewidth ≈ 1.268 kHz) is generated for the first time, indicating its promising ultranarrow photonic application.
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Affiliation(s)
- Safayet Ahmed
- Department of Applied Physics, Materials Research Center, Photonics Research Institute, and Research Institute for Advanced Manufacturing, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, 999077, China
- Shenzhen Research Institute, The Hong Kong Polytechnic University, Shenzhen, 518057, China
| | - Yiyu Gan
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China
| | - Ahmed Mortuza Saleque
- Department of Applied Physics, Materials Research Center, Photonics Research Institute, and Research Institute for Advanced Manufacturing, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, 999077, China
- Shenzhen Research Institute, The Hong Kong Polytechnic University, Shenzhen, 518057, China
| | - Honglei Wu
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China
| | - Junpeng Qiao
- School of Physics and Physical Engineering, Qufu Normal University, Qufu, 273165, China
| | - Md Nahian Al Subri Ivan
- Department of Applied Physics, Materials Research Center, Photonics Research Institute, and Research Institute for Advanced Manufacturing, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, 999077, China
- Shenzhen Research Institute, The Hong Kong Polytechnic University, Shenzhen, 518057, China
| | - Sumaiya Umme Hani
- Department of Applied Physics, Materials Research Center, Photonics Research Institute, and Research Institute for Advanced Manufacturing, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, 999077, China
- Shenzhen Research Institute, The Hong Kong Polytechnic University, Shenzhen, 518057, China
| | - Tawsif Ibne Alam
- Department of Applied Physics, Materials Research Center, Photonics Research Institute, and Research Institute for Advanced Manufacturing, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, 999077, China
- Shenzhen Research Institute, The Hong Kong Polytechnic University, Shenzhen, 518057, China
| | - Qiao Wen
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China
| | - Yuen Hong Tsang
- Department of Applied Physics, Materials Research Center, Photonics Research Institute, and Research Institute for Advanced Manufacturing, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, 999077, China
- Shenzhen Research Institute, The Hong Kong Polytechnic University, Shenzhen, 518057, China
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