A novel approach for fabrication of a tunable grating is introduced.First

use the method of UV lithography to fabricate a micron-scale grating structure with a period of 8 μm

and transfer the micron-scale grating to PDMS film to obtain the embedded PDMS grating.Taking advantage of excellent elasticity of PDMS

stretch the film along the grating line

as the grating line elongating

grating constant decrease and the period control limit is 5 μm.Traditional method for tunable grating fabrication has harsh process condition

complex fabrication process

high costs and long cycle.This method for adjustable grating fabrication has advantages of low cost

short cycle

simple process and easy to control

so it can be widely used in micro-spectrometer

scanners

optical communications and other fields.