We study optical properties of nanoimprinted gratings infiltrated with liquid crystal (LC). One-dimensional grating of a line-spacing pattern is used as a distributed feedback cavity. After filling LC into the trenches of the grating, the LC molecules align along the trench of grating and it shows uniform planar alignment. By optical pumping, laser emission occurs and the laser wavelength can be tuned by temperature control or application of voltage. We also demonstrate control of diffraction intensities from a two-dimensional grating using LC molecular reorientation in micro space.