Second-harmonic-generation microscope using eight-segment polarization-mode converter to observe three-dimensional...

Area of Science:

• Optics and Photonics
• Materials Science
• Biophysics

Background:

• Precise control of light polarization is crucial for advanced microscopy techniques.
• Existing methods for 3D polarization control can be complex or limited in flexibility.

Purpose of the Study:

• To develop a compact and versatile polarization-mode converter for microscopy.
• To enable precise control of three-dimensional polarization at the focal plane.
• To demonstrate its application in advanced imaging modalities.

Main Methods:

• Designed a converter using two liquid-crystal spatial light modulators with segmented electrodes and a quarter-waveplate.
• Configured the device to convert linearly polarized light into three distinct polarization modes: orthogonal linear and pseudo-radial.
• Integrated the converter into a second-harmonic-generation microscopy setup.

Main Results:

• Successfully generated three controllable polarization modes at the microscope's focus.
• Demonstrated the converter's capability to precisely control polarization states.
• Achieved sensitive detection of three-dimensional molecular orientation using second-harmonic-generation microscopy.

Conclusions:

• The developed polarization-mode converter offers a compact and effective solution for 3D polarization control in microscopy.
• This technology facilitates enhanced imaging of molecular structures and orientations.
• The device shows significant potential for applications in materials science and biophysics.