An image system comprises a light valve and an image capturing unit. The novel bone graft includes at least one of: fluorapatite nano-crystalline coated non-ceramic hydrophilic hydroxylapatite crystals; and a combination of fluorapatite nano-crystalline coated non-ceramic hydrophilic hydroxylapatite crystals and fluorapatite nano-crystalline coated hydroxylapatite crystal clusters. A laser beam is emitted toward a direction opposite to a side of the photonic crystal layer on which the electrode is provided. Each beam includes at least one channel that extends along at least a portion of the beam.