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A Guide to Structured Illumination TIRF Microscopy at High Speed with Multiple Colors

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Quantitative structured-illumination phase microscopy.

Sri Rama Prasanna Pavani¹, Ariel R Libertun, Sharon V King

¹Micro Optical-Imaging Systems Laboratory, Department of Electrical and Computer Engineering, University of Colorado, Campus Box 425, Boulder, Colorado 80309, USA. pavani@colorado.edu

|December 25, 2007

Summary

This study presents a new quantitative phase imaging technique for homogeneous objects. The method uses an amplitude mask and digital processing to accurately measure optical path length profiles.

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Area of Science:

Optical Physics
Microscopy
Image Processing

Background:

Quantitative phase imaging is crucial for characterizing transparent materials.
Traditional methods can be complex or limited in application.
Bright field microscopy is widely accessible.

Purpose of the Study:

To develop a novel quantitative phase imaging method for homogeneous objects.
To enable optical path length (OPL) profile measurement using a standard bright field microscope.

Main Methods:

Utilized an amplitude mask in the field diaphragm of a bright field transmission microscope.
Imaged a known amplitude pattern onto the phase object.
Recorded the distorted pattern using a CCD detector.
Applied a digital processing algorithm with a closed-form analytical solution based on ray optics.

Main Results:

Successfully distorted an amplitude pattern based on the object's OPL profile.
Developed a digital algorithm to quantitatively estimate the OPL profile.
The method is suitable for objects with small OPL gradients.

Conclusions:

Introduced an effective quantitative phase imaging method for homogeneous objects.
The technique leverages a bright field microscope, an amplitude mask, and digital processing.
Provides a viable approach for measuring OPL profiles in specific applications.