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Infrared Polariscopy Imaging of Linear Polymeric Patterns with a Focal Plane Array
Reo Honda1, Meguya Ryu2, Masayuki Moritake3
1Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8550, Japan. honda.r.aa@m.titech.ac.jp.
Nanomaterials (Basel, Switzerland)
|May 16, 2019
Summary
Infrared polariscopy using focal plane array Fourier-transform infrared imaging microspectroscopy significantly speeds up analysis. This technique reveals molecular dipole orientation and sub-wavelength structures in polymers.
Area of Science:
- Optics and Photonics
- Materials Science
- Spectroscopy
Background:
- Polariscopy traditionally analyzes material polarization properties.
- Infrared (IR) spectroscopy probes molecular vibrations and orientations.
- Hyperspectral imaging captures spectral information across spatial dimensions.
Purpose of the Study:
- To demonstrate and assess infrared polariscopy using focal plane array (FPA) Fourier-transform infrared (FTIR) imaging microspectroscopy.
- To evaluate the technique's capability in revealing structural motifs and molecular dipole alignment.
- To investigate the potential of reducing analysis time for polariscopy.
Main Methods:
- Utilizing FPA FTIR imaging microspectroscopy in the IR spectral region.
- Employing both thermal and high-brightness synchrotron light sources for illumination.
- Analyzing natural and laser-fabricated polymers with sub-wavelength features.
Main Results:
- Substantial reduction in time required for IR polariscopy was achieved using FPA-FTIR imaging.
- Alignment of absorbing molecular dipoles was successfully revealed in polymer samples.
- Higher-order patterns, including laser-fabricated structures, were visualized and their orientation determined.
Conclusions:
- FPA-FTIR imaging microspectroscopy offers a significantly faster approach to infrared polariscopy.
- The technique effectively characterizes the orientation of molecular dipoles and sub-wavelength structures.
- Spectral polariscopy at absorption peaks can orient sub-wavelength patterns even without spatial resolution.
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