Nanoscale　photonic　structures　are　patterned　directly　by　exposing　a　thin　film　of　conjugated　polymer　to　the　interference　pattern　of　UV　laser　beams,　thus　inducing　crosslinking　between　the　polymer　molecules　in　the　bright　fringes.　The　crosslinked　polymer　molecules　become　indissolvable　in　organic　solvent　due　to　the　localized　photochemical　modification,　enabling　successful　lift-off　of　the　soft　grating　structures.　The　resultant　nanodevice　exhibits　excellent　chemical　and　physical　stability.　This　demonstrates　the　high　spatial　resolution　of　the　crosslinking　process　and　introduces　a　direct　nanofabrication　technique,　which　may　be　utilized　in　the　design　of　optoelectronic　and　laser　devices.