This project focuses on the separation of optical absorption and birefringence effects at increasingly smaller scales, approaching the wavelength of light. This requires new methods of measurements due to increased light scattering. Structuring of materials at smaller scales changes their optical mechanical and thermal properties.
The following example shows generation of birefringence by laser structuring/printing.
Figure: Precise tuning of refractive index. PMMA structured by tightly focused 800 nm/150 fs laser pulses; numerical aperture of the objective lens was 1.4. Pulse energy: 50 (1), 40 (2), 30 (3), and 20 nJ (4); the pattern (4) has larger density of irradiation points. The birefringence is measured along the horizontal central cross-section.