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Flexible contrast for low-coherence interference microscopy by Fourier-plane filtering with a spatial light modulator
Stefan E Schausberger1, Bettina Heise, Christian Maurer
1Christian Doppler Laboratory for Microscopic and Spectroscopic Material Characterisation, Johannes Kepler University Linz, A-4040 Linz, Austria. stefan.schausberger@jku.at
Optics Letters
|December 18, 2010
Summary
This study introduces a novel full-field low-coherence interference microscope. It uses Fourier-plane filtering to enable adjustable contrast modes, enhancing visualization of sample details.
Area of Science:
- Optical microscopy
- Interferometry
- Image processing
Background:
- Low-coherence interference (LCI) microscopy offers depth-resolved imaging.
- Traditional LCI contrast is limited, hindering detailed structural analysis.
- Spatial light modulators (SLMs) enable dynamic control of optical wavefronts.
Purpose of the Study:
- To develop a versatile full-field LCI microscope with tunable contrast modes.
- To demonstrate the capability of Fourier-plane filtering for contrast manipulation.
- To enhance the visualization of internal structures and edges in microscopic samples.
Main Methods:
- Implementation of a full-field low-coherence interference microscope.
- Utilizing a spatial light modulator (SLM) for Fourier-plane filtering.
- Modulating phase and spatial frequencies of the backreflected wavefront.
Main Results:
- Successful emulation of various contrast modes, including spiral phase contrast.
- Demonstrated enhancement of internal structures and edges in LCI images.
- Revealed complementary details within investigated samples through contrast manipulation.
Conclusions:
- The proposed LCI microscope provides adaptable contrast capabilities.
- Fourier-plane filtering with SLMs is effective for contrast control in LCI.
- This technique offers improved imaging for detailed structural analysis.
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