AI Article Synopsis
- Ultrafast photonics is gaining importance due to advancements in generating compact and efficient ultrafast pulses, with wide spectrum bandwidth being crucial for this process.
- Researchers utilized monoclinic NbGeTe, a new narrow-gap semiconductor, as a saturable absorber, which has excellent optical absorption capabilities.
- The study findings showed that NbGeTe has significant potential for ultrafast photonic applications, including successful femtosecond mode-locked operation in a specially designed ring cavity.
Article Abstract
Ultrafast photonics has become an interdisciplinary topic of great consequence due to the spectacular progress of compact and efficient ultrafast pulse generation. Wide spectrum bandwidth is the key element for ultrafast pulse generation due to the Fourier transform limitation. Herein, monoclinic NbGeTe, an emerging class of ternary narrow-gap semiconductors, was used as a real saturable absorber (SA), which manifests superior wide-range optical absorption. The crystallization form and growth mechanism of NbGeTe were revealed by a thermodynamic phase diagram. Furthermore, the NbGeTe-SA showed reliable saturation intensity and larger modulation depth, ascribed to a built-in electric field driven by the asymmetric crystal architecture confirmed via X-ray diffraction, polarized Raman spectra, and scanning transmission electron microscopy. Based on the NbGeTe-SA, femtosecond mode-locked operation with good overall performance was achieved by a properly designed ring cavity. These results suggest that NbGeTe shows great promise for ultrafast photonic applications and arouse interests in exploring the intriguing properties of the ternary van der Waals material family.
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| http://dx.doi.org/10.1021/acsnano.1c10241 | DOI Listing |
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