Large-Angle Color Dispersion Based on 2-D Hexagonal Subwavelength Holographic Gratings

This paper presents large-angle color dispersion using a holographically fabricated 2-D subwavelength transmission grating. A dispersion angle of 68^° is observed within continuous spectrum dispersion from 360 to 700 nm at an incident angle of 20 ^° using white light as a probe beam. By changing the angle between the sample normal and the probe beam, the dispersed spectrum can be tuned at a spectral resolution of 3.6 nm per degree.