Indirect absorption spectroscopy using quantum cascade lasers: Mid-infrared refractometry and photothermal spectroscopy
| Autor: | Peer Fischer, Alexander Ruf, Marcel Pfeifer |
|---|---|
| Přispěvatelé: | Publica |
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
spectroscopy
Materials science Absorption spectroscopy Photothermal spectroscopy business.industry total internal reflection Physics::Optics Photothermal microspectroscopy Photothermal therapy Laser Atomic and Molecular Physics and Optics law.invention Optics law infrared Optoelectronics photothermal effect business Quantum cascade laser Absorption (electromagnetic radiation) Refractometry absorption |
| Zdroj: | Optics Express |
| Popis: | We record vibrational spectra with two indirect schemes that depend on the real part of the index of refraction: mid-infrared refractometry and photothermal spectroscopy. In the former, a quantum cascade laser (QCL) spot is imaged to determine the angles of total internal reflection, which yields the absorption line via a beam profile analysis. In the photothermal measurements, a tunable QCL excites vibrational resonances of a molecular monolayer, which heats the surrounding medium and changes its refractive index. This is observed with a probe laser in the visible. Sub-monolayer sensitivities are demonstrated. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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