Temperature-dependent refractive index of AlGaAs for quantum-photonic devices near the bandgap
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arXiv
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866908686610333696 |
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| author | Langer, Moritz Dhurjati, Sai Abhishikth Bauer, Martin Zena, Yared Getahun Rahimi, Ahmad Bassoli, Riccardo Fitzek, Frank H. P. Schmidt, Oliver G. Hopfmann, Caspar |
| author_facet | Langer, Moritz Dhurjati, Sai Abhishikth Bauer, Martin Zena, Yared Getahun Rahimi, Ahmad Bassoli, Riccardo Fitzek, Frank H. P. Schmidt, Oliver G. Hopfmann, Caspar |
| contents | We present an experimental method to determine the refractive index of $Al_{x}Ga_{1-x}As$ (x = 0.0 - 0.5) from 300 K to 4 K across the 500 - 1100 nm wavelength range. The values are extracted from spectroscopically observed microcavity resonances in thin $Al_{x}Ga_{1-x}As$ membranes embedded between fully and partially reflective gold mirrors. Refined Varshni and Paessler models are used to describe temperature-dependent bandgap shifts and material composition. By tracking resonance shifts and benchmarking against finite-difference time-domain simulations, we derive the dispersive optical response with high precision. This yields a quantitatively improved analytical expression for the refractive index of $Al_{x}Ga_{1-x}As$ matching the experimental results with a coefficient of determination as high as $R^2=0.993$, enabling accurate modeling near the band edge at cryogenic temperatures. The method is straightforward and broadly applicable to other semiconductor systems, offering a valuable tool for the design of micro photonic devices such as quantum light sources. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2512_02212 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Temperature-dependent refractive index of AlGaAs for quantum-photonic devices near the bandgap Langer, Moritz Dhurjati, Sai Abhishikth Bauer, Martin Zena, Yared Getahun Rahimi, Ahmad Bassoli, Riccardo Fitzek, Frank H. P. Schmidt, Oliver G. Hopfmann, Caspar Optics Materials Science 78.67, 81.04 We present an experimental method to determine the refractive index of $Al_{x}Ga_{1-x}As$ (x = 0.0 - 0.5) from 300 K to 4 K across the 500 - 1100 nm wavelength range. The values are extracted from spectroscopically observed microcavity resonances in thin $Al_{x}Ga_{1-x}As$ membranes embedded between fully and partially reflective gold mirrors. Refined Varshni and Paessler models are used to describe temperature-dependent bandgap shifts and material composition. By tracking resonance shifts and benchmarking against finite-difference time-domain simulations, we derive the dispersive optical response with high precision. This yields a quantitatively improved analytical expression for the refractive index of $Al_{x}Ga_{1-x}As$ matching the experimental results with a coefficient of determination as high as $R^2=0.993$, enabling accurate modeling near the band edge at cryogenic temperatures. The method is straightforward and broadly applicable to other semiconductor systems, offering a valuable tool for the design of micro photonic devices such as quantum light sources. |
| title | Temperature-dependent refractive index of AlGaAs for quantum-photonic devices near the bandgap |
| topic | Optics Materials Science 78.67, 81.04 |
| url | https://arxiv.org/abs/2512.02212 |