Photo-induced carrier dynamics in InSb probed with broadband THz spectroscopy based on BNA crystals
Fuente:
arXiv
Enregistré dans:
| Auteurs principaux: | , , , , , |
|---|---|
| Format: | Preprint |
| Publié: |
2025
|
| Sujets: | |
| Accès en ligne: | |
| Tags: |
Ajouter un tag
Pas de tags, Soyez le premier à ajouter un tag!
|
| _version_ | 1866918218299342848 |
|---|---|
| author | Iglesis, Elodie Alekhin, Alexandr Cazayous, Maximilien Sacuto, Alain Gallais, Yann Houver, Sarah |
| author_facet | Iglesis, Elodie Alekhin, Alexandr Cazayous, Maximilien Sacuto, Alain Gallais, Yann Houver, Sarah |
| contents | We report an optical pump - terahertz (THz) probe study of the photoinduced transient carrier dynamics in the low bandgap semiconductor Indium Antimonide (InSb). Using an organic N-benzyl-2-methyl-nitroaniline (BNA) crystal as a broadband THz source, we access the full spectral response over more than 5 THz, for varying pump-probe delay following the optical excitation. Using the Drude-Lorentz model accounting for differences between the excited length in material and the penetration depth of THz beam in pumped InSb, we extract the absolute carrier density as a function of the pump-probe delay, and provide insights on the diffusion length at given carrier densities, for different pump fluences. The mismatch between the THz penetration depth and the actual excited sample depth after carrier diffusion is discussed, since their evolutions with time and pump fluence are not intuitive as both quantities depend on carrier density. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_20896 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Photo-induced carrier dynamics in InSb probed with broadband THz spectroscopy based on BNA crystals Iglesis, Elodie Alekhin, Alexandr Cazayous, Maximilien Sacuto, Alain Gallais, Yann Houver, Sarah Materials Science We report an optical pump - terahertz (THz) probe study of the photoinduced transient carrier dynamics in the low bandgap semiconductor Indium Antimonide (InSb). Using an organic N-benzyl-2-methyl-nitroaniline (BNA) crystal as a broadband THz source, we access the full spectral response over more than 5 THz, for varying pump-probe delay following the optical excitation. Using the Drude-Lorentz model accounting for differences between the excited length in material and the penetration depth of THz beam in pumped InSb, we extract the absolute carrier density as a function of the pump-probe delay, and provide insights on the diffusion length at given carrier densities, for different pump fluences. The mismatch between the THz penetration depth and the actual excited sample depth after carrier diffusion is discussed, since their evolutions with time and pump fluence are not intuitive as both quantities depend on carrier density. |
| title | Photo-induced carrier dynamics in InSb probed with broadband THz spectroscopy based on BNA crystals |
| topic | Materials Science |
| url | https://arxiv.org/abs/2511.20896 |