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Multicolor Fluorescence Detection for Droplet Microfluidics Using Optical Fibers

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Chromatic confocal microscopy with a novel wavelength detection method using transmittance.

Taejoong Kim¹, Sang Hoon Kim, DukHo Do

¹Nanoscope Systems, Inc, Daejeon 305-509, South Korea.

|March 14, 2013

Summary

A new transmittance detection method enhances chromatic confocal microscopy (CCM) for faster 3D surface imaging. This non-destructive technique eliminates mechanical scanning, improving speed for industrial applications.

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Area of Science:

Optical Metrology
Microscopy
Surface Science

Background:

Chromatic confocal microscopy (CCM) offers high-speed 3D surface profiling without mechanical scanning.
Existing CCM systems are limited in speed by spectrometer-based depth information acquisition.
Spectrometers encode depth information using axial color, creating a bottleneck for rapid imaging.

Purpose of the Study:

To develop a novel, high-speed 3D surface profiling method using chromatic confocal microscopy.
To overcome the speed limitations imposed by spectrometer-based depth measurement in CCM.
To introduce a non-destructive technique for instantaneous depth information acquisition.

Main Methods:

A new chromatic confocal microscopy method utilizing transmittance detection was developed.
Depth information is acquired instantaneously by analyzing the ratio of intensity signals from two photomultiplier tubes.
A color filter is used to detect the peak wavelength, enabling rapid depth measurement.

Main Results:

The novel method achieves high-speed 3D surface profiling.
Instantaneous depth information is obtained without mechanical scanning.
The system demonstrates non-destructive surface characterization capabilities.

Conclusions:

The developed transmittance detection method significantly enhances CCM speed for 3D imaging.
This non-destructive, high-speed surface profiling technique has potential applications in various industries.
Potential applications include semiconductor manufacturing, flat panel display inspection, and material science.