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 to diffract light reflected by 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 adjacent recording layer from interfering with light reflected by the target recording layer;
• and
• a transmitting region arranged about the diffracting region to transmit incident light,
• 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.

A unit to remove crosstalk, the unit comprising:

• a diffracting region to selectively reduce crosstalk between light reflected by adjacent recording layers and to selectively transmit light reflected by a target recording layer among the adjacent recording layers;
• and
• a transmitting region arranged about the diffracting region to transmit light having different wavelengths
• wherein a diffraction efficiency of the diffracting region is determined according to the light having different wavelengths.