Formation of waveguides in crystalline organic N-benzyl-2-methyl-4-nitroaniline thin films using femtosecond laser ablation process

•Femtosecond laser ablation better than any lithography techniques.•XRD results show that overall the crystallinity is maintained after ablation.•FTIR results show no change in the functional groups of the material after ablation.•Waveguides are fabricated in organic BNA films. This paper reports the feasibility of femtosecond laser etching of microstructures directly onto crystalline N-benzyl-2-methyl-4-nitroaniline (BNA) films grown on glass to realize single crystal BNA waveguides. The threshold fluence has been estimated and fluence range of 318.5–1274 mJ/cm2 at 800 nm is used for ablation. Holes with diameter ranging from 13 to 26 μm and waveguide patterns with width of 100 μm are demonstrated. Grooves with laser transit gap