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<p>This study presents a comprehensive theoretical investigation into the linear and nonlinear optical properties of Boron Arsenide Nanotubes (BAsNTs) under an external axial magnetic field, establishing them as a superior alternative to Carbon Nanotubes (CNTs) for advanced optoelectronic applications. Employing a tight-binding framework in combination with the density matrix formalism, we demonstrate that an axial magnetic field induces a significant and tunable Aharonov-Bohm splitting in all optical spectra. Our findings reveal that BAsNTs exhibit an intrinsically stronger third-order nonlinear optical response, including the DC Kerr effect, Two-Photon Absorption (TPA) and Third-Harmonic Generation (THG), compared to CNTs of similar chirality. The applied magnetic field enables precise tuning of resonance positions and enhances the intensity of these nonlinear phenomena, with Two-Photon Absorption and Third-Harmonic Generation spectral intensities amplified by up to five-fold. The remarkable finding is the ability to magnetically control the interaction and coupling of multi-photon resonances of different orders. These findings highlight the potential of BAsNTs as a robust, chirality-independent tool for developing next-generation tunable nanophotonic devices, such as magneto-optical modulators, frequency converters, and all-optical switches.</p>

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Quantum engineering of nonlinear optical responses via the Aharonov-Bohm effect in boron arsenide nanotubes

  • 期刊论文

  • 发表日期：

    2026年1月6日

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  • Raad Chegel

摘要

This study presents a comprehensive theoretical investigation into the linear and nonlinear optical properties of Boron Arsenide Nanotubes (BAsNTs) under an external axial magnetic field, establishing them as a superior alternative to Carbon Nanotubes (CNTs) for advanced optoelectronic applications. Employing a tight-binding framework in combination with the density matrix formalism, we demonstrate that an axial magnetic field induces a significant and tunable Aharonov-Bohm splitting in all optical spectra. Our findings reveal that BAsNTs exhibit an intrinsically stronger third-order nonlinear optical response, including the DC Kerr effect, Two-Photon Absorption (TPA) and Third-Harmonic Generation (THG), compared to CNTs of similar chirality. The applied magnetic field enables precise tuning of resonance positions and enhances the intensity of these nonlinear phenomena, with Two-Photon Absorption and Third-Harmonic Generation spectral intensities amplified by up to five-fold. The remarkable finding is the ability to magnetically control the interaction and coupling of multi-photon resonances of different orders. These findings highlight the potential of BAsNTs as a robust, chirality-independent tool for developing next-generation tunable nanophotonic devices, such as magneto-optical modulators, frequency converters, and all-optical switches.