Abstract: A lighting device includes a lighting film including a prism layer that emits incident light in a prescribed direction, and a rigid body that includes a receiving unit having a prescribed cross-sectional rigidity and supporting the lighting film, and a retaining unit that fixes the lighting film to the receiving unit.

Abstract: Provided is a lighting device that can be easily attached to and removed from a panel. The lighting device includes a lighting film including a prism layer configured to emit incident light toward a prescribed direction as emitted light and a double-sided adhesive adhering to at least a part of an outer periphery of the lighting film and including both surfaces having adhesiveness on a side of the incident light and a side of the emitted light, wherein at least one of a peeling strength and a shear bonding strength on the side of the incident light is less than that on the side of the emitted light.

Abstract: The lighting device includes: a lighting film having a rectangular shape including a first surface and a second surface; and a support member configured to support the lighting film on at least two opposite sides of four sides of the lighting film so that a first surface and a second surface are positioned substantially parallel to a vertical direction, wherein the support member includes: a first support portion disposed opposite the first surface; a second support portion disposed opposite the second surface; an own weight support portion supporting an own weight of the lighting film; and a stretch allowance portion configured to allow elongation or shrinkage in a direction parallel to the first surface and the second surface of the lighting film due to a change in temperature.

Abstract: Provided is a two-dimensional photonic crystal surface emitting laser having an active layer for generating light of a predetermined wavelength range by an injection of electric current and a two-dimensional photonic crystal layer provided on one side of the active layer, the layer having a plate-shaped base member in which modified refractive index areas whose refractive index differs from that of the base member are arranged.

Abstract: A photonic crystal surface emission laser includes an active layer, and a photonic crystal layer made of a plate-shaped slab provided with modified refractive index area having a refractive index different from that of the slab, the modified refractive index areas being arranged on each of the lattice points of a first rhombic-like lattice and a second rhombic-like lattice in which both diagonals are mutually parallel and only one diagonal is of a different length, wherein ax1, ax2, ay, and n satisfy the following inequality: ? 1 a x ? ? 1 - 1 a x ? ? 2 ? ( 1 a x ? ? 1 + 1 a x ? ? 2 ) 2 + ( 2 a y ) 2 ? 1 n .

Abstract: Provided is a two-dimensional photonic crystal surface emitting laser having an active layer for generating light of a predetermined wavelength range by an injection of electric current and a two-dimensional photonic crystal layer provided on one side of the active layer, the layer having a plate-shaped base member in which modified refractive index areas whose refractive index differs from that of the base member are arranged.

Abstract: A photonic crystal surface emission laser includes an active layer, and a photonic crystal layer made of a plate-shaped slab provided with modified refractive index area having a refractive index different from that of the slab, the modified refractive index areas being arranged on each of the lattice points of a first rhombic-like lattice and a second rhombic-like lattice in which both diagonals are mutually parallel and only one diagonal is of a different length, wherein ax1, ax2, ay, and n satisfy the following inequality: ? 1 a x ? ? 1 - 1 a x ? ? 2 ? ( 1 a x ? ? 1 + 1 a x ? ? 2 ) 2 + ( 2 a y ) 2 ? 1 n .