Room-temperature, continuous-wave Terahertz generation in free-space with an intersubband mid-infrared photomixer
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arXiv
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| Autori principali: | , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| author | Lin, Q. Lampin, J-F. Ducournau, G. Lepillet, S. Li, H. Peytavit, E. Barbieri, S. |
| author_facet | Lin, Q. Lampin, J-F. Ducournau, G. Lepillet, S. Li, H. Peytavit, E. Barbieri, S. |
| contents | We demonstrate a Terahertz photomixer pumped by mid-infrared photons at 10$μ$m wavelength. The device is based on a dual-antenna architecture, in which a two-dimensional array of mid-infrared patch-antenna resonators is connected to the electrodes of a log-spiral Terahertz antenna. By exploiting intersubband absorption inside an AlGaAs-GaAs multi-quantum-well heterostructure, a photocurrent is coherently generated at the difference frequency between two quantum cascade lasers. The photocurrent drives the antenna electrodes allowing tunable, continuous-wave generation in free-space up to 1 Terahertz at room temperature. By experimentally studying the photomixer frequency response and dark impedance, we demonstrate that the observed power roll-off at high-frequency is limited by the combined effect of the photoexcited carrier's intrinsic lifetime and of the device $RC$ time constant. In the spectral range investigated we obtain, in continuous-wave, mid-infrared $\rightarrow$ Terahertz conversion efficiencies exceeding by orders of magnitude those of unipolar devices exploiting $χ^{(2)}$ processes. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_06091 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Room-temperature, continuous-wave Terahertz generation in free-space with an intersubband mid-infrared photomixer Lin, Q. Lampin, J-F. Ducournau, G. Lepillet, S. Li, H. Peytavit, E. Barbieri, S. Optics Applied Physics We demonstrate a Terahertz photomixer pumped by mid-infrared photons at 10$μ$m wavelength. The device is based on a dual-antenna architecture, in which a two-dimensional array of mid-infrared patch-antenna resonators is connected to the electrodes of a log-spiral Terahertz antenna. By exploiting intersubband absorption inside an AlGaAs-GaAs multi-quantum-well heterostructure, a photocurrent is coherently generated at the difference frequency between two quantum cascade lasers. The photocurrent drives the antenna electrodes allowing tunable, continuous-wave generation in free-space up to 1 Terahertz at room temperature. By experimentally studying the photomixer frequency response and dark impedance, we demonstrate that the observed power roll-off at high-frequency is limited by the combined effect of the photoexcited carrier's intrinsic lifetime and of the device $RC$ time constant. In the spectral range investigated we obtain, in continuous-wave, mid-infrared $\rightarrow$ Terahertz conversion efficiencies exceeding by orders of magnitude those of unipolar devices exploiting $χ^{(2)}$ processes. |
| title | Room-temperature, continuous-wave Terahertz generation in free-space with an intersubband mid-infrared photomixer |
| topic | Optics Applied Physics |
| url | https://arxiv.org/abs/2501.06091 |