Mid-infrared Energy Deposition Spectroscopy
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arXiv
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866909364577632256 |
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| author | Yin, Jiaze Pfluegl, Christian Teng, Chu C. Bolarinho, Rylie Chen, Guo Gong, Xinrui Dong, Dashan Vakhshoori, Daryoosh Cheng, Ji-Xin |
| author_facet | Yin, Jiaze Pfluegl, Christian Teng, Chu C. Bolarinho, Rylie Chen, Guo Gong, Xinrui Dong, Dashan Vakhshoori, Daryoosh Cheng, Ji-Xin |
| contents | Photothermal microscopy is an emerging tool for measuring light-matter interactions with single-molecule sensitivity. It is generally believed that the spectral acquisition speed in photothermal microscopy is limited by the slow thermal diffusion process. Here, we demonstrate mid-infrared energy deposition (MIRED) spectroscopy, which offers both microsecond-scale temporal resolution and sub-micron spatial resolution. In this approach, the photothermal process is optically probed while the infrared pulses from a quantum cascade laser array are rapidly tuned. Based on Newton's law, the energy deposition corresponds to the first derivative of local temperature rise over time and provides the instantaneous infrared absorption. By employing time-resolved measurement of transient energy deposition, the upper limit for spectrum encoding shifts to the vibrational relaxation level, which occurs on the picosecond scale. This method significantly increases the detection bandwidth while maintaining the sensitivity and resolution advantages of photothermal detection. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_19090 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Mid-infrared Energy Deposition Spectroscopy Yin, Jiaze Pfluegl, Christian Teng, Chu C. Bolarinho, Rylie Chen, Guo Gong, Xinrui Dong, Dashan Vakhshoori, Daryoosh Cheng, Ji-Xin Optics Instrumentation and Detectors Photothermal microscopy is an emerging tool for measuring light-matter interactions with single-molecule sensitivity. It is generally believed that the spectral acquisition speed in photothermal microscopy is limited by the slow thermal diffusion process. Here, we demonstrate mid-infrared energy deposition (MIRED) spectroscopy, which offers both microsecond-scale temporal resolution and sub-micron spatial resolution. In this approach, the photothermal process is optically probed while the infrared pulses from a quantum cascade laser array are rapidly tuned. Based on Newton's law, the energy deposition corresponds to the first derivative of local temperature rise over time and provides the instantaneous infrared absorption. By employing time-resolved measurement of transient energy deposition, the upper limit for spectrum encoding shifts to the vibrational relaxation level, which occurs on the picosecond scale. This method significantly increases the detection bandwidth while maintaining the sensitivity and resolution advantages of photothermal detection. |
| title | Mid-infrared Energy Deposition Spectroscopy |
| topic | Optics Instrumentation and Detectors |
| url | https://arxiv.org/abs/2410.19090 |