Quantum-sized topological insulators/semimetals enable ultrahigh and broadband saturable absorption
文献信息
Two-dimensional topological insulators/semimetals have recently attracted much attention. However, quantum-sized topological insulators/semimetals with intrinsic characteristics have never been reported before. Herein, we report the high-yield production of topological insulator (i.e., Bi2Se3 and Sb2Te3) and semimetal (i.e., TiS2) quantum sheets (QSs) with monolayer structures and sub-4 nm lateral sizes. Both linear and nonlinear optical performances of the QSs are investigated. The QS dispersions present remarkable photoluminescence with excitation wavelength-, concentration-, and solvent-dependence. The solution-processed QSs-poly(methyl methacrylate) (PMMA) hybrid thin films demonstrate exceptional nonlinear saturation absorption (NSA). Particularly, Bi2Se3 QSs-PMMA enables record-high NSA performance with a broadband feature. Specifically, the (absolute) modulation depths up to 71.6 and 72.4% and saturation intensities down to 1.52 and 0.49 MW cm−2 are achieved at 532 and 800 nm, respectively. Such a phenomenal NSA performance would greatly facilitate their applications in mode-locked lasers and related fields.
期刊推荐

Polycyclic Aromatic Compounds

Journal of Asian Natural Products Research

Medicinal Chemistry Research

Critical Reviews in Solid State and Materials Sciences

Biocatalysis and Biotransformation

Journal of the Indian Institute of Science

Bioorganic & Medicinal Chemistry Letters

Bioorganic & Medicinal Chemistry

Main Group Chemistry

Herald of the Russian Academy of Sciences
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Nanoscale Horizons

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