Unit to remove crosstalk in multi-layered disk, optical pickup including the unit, and optical recording and/or reproducing apparatus including the optical pickup

A unit to remove crosstalk, comprising:

• a diffracting region configured to diffract light reflected from a recording layer adjacent to a target recording layer, on and/or from which data is to be recorded and/or reproduced, of a disk having a plurality of recording layers to prevent the light reflected by the recording layer adjacent to the target recording layer from reaching a photodetector and to prevent the light reflected by the adjacent recording layer from interfering with light reflected by the target recording layer;
• and
• a transmitting region arranged about the diffracting region and configured to transmit light reflected from the target recording layer,
• wherein the diffracting region is divided into a first region and a second region, and the first and second regions have diffraction patterns arranged in different directions.