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20 August 2020 Field-resolved spectroscopy of aqueous biological samples
Marinus Huber, Ioachim Pupeza, Michael Trubetskov, Wolfgang Schweinberger, Syed Hussain, Christina Hofer, Mihaela Zigman, Ferenc Krausz
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Proceedings Volume 11499, Terahertz Emitters, Receivers, and Applications XI; 114990K (2020) https://doi.org/10.1117/12.2570500
Event: SPIE Optical Engineering + Applications, 2020, Online Only
Abstract
Electro-optic sampling (EOS) has established itself as one of the main techniques for coherent THz spectroscopy. In recent years, EOS has been pushed towards recording infrared or even optical waveforms, opening up new possibilities for spectroscopy in these spectral regions. In this contribution, we demonstrate the potential of electric-field-resolved detection via EOS for broadband, mid-infrared molecular vibrational spectroscopy. We show that field-resolved spectroscopy can achieve detection sensitivities orders of magnitude higher than state-of-the art Fourier-transform infrared spectroscopy. This is achieved by high-quantum-efficiency non-linear temporal “piercing” and, therefore, isolation of the molecular signal from the orders-of-magnitude stronger impulsive excitation. Thereby limitations due to detector dynamic range and source excitation noise can be avoided. This promises a new level of molecular sensitivity and molecular coverage for probing complex biological samples.
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Marinus Huber, Ioachim Pupeza, Michael Trubetskov, Wolfgang Schweinberger, Syed Hussain, Christina Hofer, Mihaela Zigman, and Ferenc Krausz "Field-resolved spectroscopy of aqueous biological samples", Proc. SPIE 11499, Terahertz Emitters, Receivers, and Applications XI, 114990K (20 August 2020); https://doi.org/10.1117/12.2570500
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KEYWORDS
Spectroscopy
Field spectroscopy
Infrared spectroscopy
Signal to noise ratio
FT-IR spectroscopy
Infrared radiation
Molecular spectroscopy
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