Tunable second harmonic generation in 2D materials: comparison of different strategies
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866929614396325888 |
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| author | Grillo, Simone Cannuccia, Elena Palummo, Maurizia Pulci, Olivia Attaccalite, Claudio |
| author_facet | Grillo, Simone Cannuccia, Elena Palummo, Maurizia Pulci, Olivia Attaccalite, Claudio |
| contents | Nonlinear optical frequency conversion, where optical fields interact with a nonlinear medium to generate new frequencies, is a key phenomenon in modern photonic systems. However, a major challenge with these techniques lies in the difficulty of tuning the nonlinear electrical susceptibilities that drive such effects in a given material. As a result, dynamic control of optical nonlinearities has remained largely confined to research laboratories, limiting its practical use as a spectroscopic tool. In this work, we aim to advance the development of devices with tunable nonlinear responses by exploring two potential mechanisms for electrically manipulating second-order optical nonlinearity in two-dimensional materials. Specifically, we consider two configurations: in the first, the material does not inherently exhibit second-harmonic generation (SHG), but this response is induced by an external field; in the second, an external field induces doping in a material that already exhibits SHG, altering the intensity of the nonlinear signal. In this work, we have studied these two configurations using a real-time ab-initio approach under an out-of-plane external field and including the effects of doping-induced variations in the screened electron-electron interaction. We then discuss the limitations of current computational methods and compare our results with experimental measurements. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2410_07661 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Tunable second harmonic generation in 2D materials: comparison of different strategies Grillo, Simone Cannuccia, Elena Palummo, Maurizia Pulci, Olivia Attaccalite, Claudio Materials Science Mesoscale and Nanoscale Physics Optics Nonlinear optical frequency conversion, where optical fields interact with a nonlinear medium to generate new frequencies, is a key phenomenon in modern photonic systems. However, a major challenge with these techniques lies in the difficulty of tuning the nonlinear electrical susceptibilities that drive such effects in a given material. As a result, dynamic control of optical nonlinearities has remained largely confined to research laboratories, limiting its practical use as a spectroscopic tool. In this work, we aim to advance the development of devices with tunable nonlinear responses by exploring two potential mechanisms for electrically manipulating second-order optical nonlinearity in two-dimensional materials. Specifically, we consider two configurations: in the first, the material does not inherently exhibit second-harmonic generation (SHG), but this response is induced by an external field; in the second, an external field induces doping in a material that already exhibits SHG, altering the intensity of the nonlinear signal. In this work, we have studied these two configurations using a real-time ab-initio approach under an out-of-plane external field and including the effects of doping-induced variations in the screened electron-electron interaction. We then discuss the limitations of current computational methods and compare our results with experimental measurements. |
| title | Tunable second harmonic generation in 2D materials: comparison of different strategies |
| topic | Materials Science Mesoscale and Nanoscale Physics Optics |
| url | https://arxiv.org/abs/2410.07661 |