Mid-infrared wide-field nanoscopy
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arXiv
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| Auteurs principaux: | , , , , , |
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| Format: | Preprint |
| Publié: |
2023
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| _version_ | 1866916718141505536 |
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| author | Tamamitsu, Miu Toda, Keiichiro Badarla, Venkata Ramaiah Shimada, Hiroyuki Konishi, Kuniaki Ideguchi, Takuro |
| author_facet | Tamamitsu, Miu Toda, Keiichiro Badarla, Venkata Ramaiah Shimada, Hiroyuki Konishi, Kuniaki Ideguchi, Takuro |
| contents | Mid-infrared (MIR) spectroscopy is widely recognized as a powerful, non-distractive method for chemical analysis. However, its utility is constrained by a micrometer-scale spatial resolution imposed by the long-wavelength MIR diffraction limit. This limitation has been recently overcome by MIR photothermal (MIP) imaging, which detects photothermal effects induced in the vicinity of MIR absorbers using a visible-light microscope. Despite its promise, the full potential of its spatial resolving power has not been realized. Here, we present an optimal implementation of wide-field MIP imaging to achieve high spatial resolution. This is accomplished by employing single-objective synthetic-aperture quantitative phase imaging (SOSA-QPI) with synchronized sub-nanosecond MIR and visible light sources, effectively suppressing the resolution-degradation effect caused by photothermal heat diffusion. We demonstrate far-field MIR spectroscopic imaging with a spatial resolution limited by the visible diffraction, down to 125 nm, in the MIR region of 3.12-3.85 um (2,600-3,200 cm-1). This technique, through the use of a shorter visible wavelength and/or a higher objective numerical aperture, holds the potential to achieve a spatial resolution of less than 100 nm, thus paving the way for MIR wide-field nanoscopy. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2306_08245 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Mid-infrared wide-field nanoscopy Tamamitsu, Miu Toda, Keiichiro Badarla, Venkata Ramaiah Shimada, Hiroyuki Konishi, Kuniaki Ideguchi, Takuro Optics Mid-infrared (MIR) spectroscopy is widely recognized as a powerful, non-distractive method for chemical analysis. However, its utility is constrained by a micrometer-scale spatial resolution imposed by the long-wavelength MIR diffraction limit. This limitation has been recently overcome by MIR photothermal (MIP) imaging, which detects photothermal effects induced in the vicinity of MIR absorbers using a visible-light microscope. Despite its promise, the full potential of its spatial resolving power has not been realized. Here, we present an optimal implementation of wide-field MIP imaging to achieve high spatial resolution. This is accomplished by employing single-objective synthetic-aperture quantitative phase imaging (SOSA-QPI) with synchronized sub-nanosecond MIR and visible light sources, effectively suppressing the resolution-degradation effect caused by photothermal heat diffusion. We demonstrate far-field MIR spectroscopic imaging with a spatial resolution limited by the visible diffraction, down to 125 nm, in the MIR region of 3.12-3.85 um (2,600-3,200 cm-1). This technique, through the use of a shorter visible wavelength and/or a higher objective numerical aperture, holds the potential to achieve a spatial resolution of less than 100 nm, thus paving the way for MIR wide-field nanoscopy. |
| title | Mid-infrared wide-field nanoscopy |
| topic | Optics |
| url | https://arxiv.org/abs/2306.08245 |