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Full-field quantitative phase imaging by white-light interferometry with active phase stabilization and its
Xinhong Li1, Toyohiko Yamauchi, Hidenao Iwai
1State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, China.
Optics Letters
|May 27, 2006
Summary
We developed a stabilized low-coherence interferometer for high-resolution imaging. This technique quantitatively captures nanometer-scale images of unstained biological samples like HeLa cells.
Area of Science:
- Optical physics
- Biomedical imaging
- Nanotechnology
Background:
- Quantitative imaging of unstained biological samples at the nanoscale is challenging.
- Existing interferometry techniques may suffer from phase noise and limited field of view.
Purpose of the Study:
- To report a novel Koehler-illumination-based full-field, actively stabilized, low-coherence phase-shifting interferometer.
- To demonstrate its application for quantitative, nanometer-scale imaging of biological samples.
Main Methods:
- The system is built upon a white-light Michelson interferometer.
- A phase-stepping technique is employed to acquire full-field phase images.
- An actively stabilized phase-lock circuit is integrated to minimize phase noise.
Main Results:
- The interferometer successfully acquired full-field phase images of human epithelial cells (HeLa cells).
- The system demonstrated quantitative imaging capabilities on a nanometer scale.
- Phase noise was effectively reduced through active stabilization.
Conclusions:
- The developed interferometer offers a powerful tool for quantitative, nanometer-scale imaging of unstained biological specimens.
- This advancement facilitates detailed cellular analysis without the need for staining.
- The technique holds potential for various applications in cell biology and diagnostics.