This installment of image of the week features the work of Toney Teddy Fernandez et al, who, in a recent JPhysD paper, investigated the properties of optical waveguides using femtosecond lasers. Several parameters of the laser writing process, including the writing direction, affect the transient plasma distribution induced in the waveguide and the distribution can reliably predict the distribution of the waveguide’s refractive index.
The figure below shows (left) the secondary electron image of an optical waveguide laser-written at 730 nJ, with the measured plasma distribution superimposed upon it; and (right) energy-dispersive X-ray spectroscopy (EDX) of lanthanum (La) and potassium (K) (red and black, respectively), compared with the intensity profile of the plasma distribution (blue).
Secondary electron image of an optical waveguide written using a femtosecond laser at 730 nJ superimposed by the plasma distribution measured, from Toney Teddy Fernandez et al 2015 J. Phys. D: Appl. Phys. 48 155101
This work is licensed under a Creative Commons Attribution 3.0 Unported License
Image: Secondary electron image of an optical waveguide written using a femtosecond laser at 730 nJ superimposed by the plasma distribution measured, from Toney Teddy Fernandez et al 2015 J. Phys. D: Appl. Phys. 48 155101. Copyright IOP Publishing 2015.
Categories: Journal of Physics D: Applied Physics
Image of the Week: Flexible, polarization-controllable diffusion metasurface with optical transparency 
Quantifying plasma chemistry products at atmospheric pressure 
Image of the Week: Direct writing using 3D printed, melt electrospun fibres 
Image of the week: Coalescence of Pickering emulsions. 
JPhys+ 