Fig. 1From: Investigation on Periodically Surface-Corrugated Long-Period Gratings Inscribed on Photonic Crystal FibersFabrication procedure of the PCF-based LPG by using a wet etching technique. a spin coating, b mounting fiber, c spin coating, d pre-baking, e UV exposure, f post baking, g developing, h etching, and i fabrication of LPGsBack to article page