Photonic crystal type light modulator and 3D image acquisition apparatus employing the same
First Claim
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1. A photonic crystal type light modulator comprising:
- a substrate;
a first electrode disposed on the substrate and formed of a transparent conductive material;
an active layer disposed on the first electrode, wherein a refractive index of the active layer changes according to application of an electric field, the active layer being directly in contact with the first electrode;
a second electrode disposed on the active layer, the second electrode being directly in contact with the active layer and formed of a transparent conductive material; and
a photonic crystal layer disposed on the second electrode, the photonic crystal layer comprising a two-dimensional (2D) grating that has a periodic arrangement of a refractive index,wherein a transmission wavelength band of the photonic crystal layer changes based on an electric field formed in the active layer by electric voltage applied between the first electrode and the second electrode.
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Abstract
A photonic crystal type light modulator is provided. The photonic crystal type light modulator includes: a substrate; a first electrode disposed on the substrate; an active layer disposed on the first electrode, where an optical characteristic of the active layer changes according to application of an electric field; a second electrode disposed on the active layer; and a photonic crystal layer disposed on the second electrode and comprising a 2D grating.
36 Citations
16 Claims
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1. A photonic crystal type light modulator comprising:
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a substrate; a first electrode disposed on the substrate and formed of a transparent conductive material; an active layer disposed on the first electrode, wherein a refractive index of the active layer changes according to application of an electric field, the active layer being directly in contact with the first electrode; a second electrode disposed on the active layer, the second electrode being directly in contact with the active layer and formed of a transparent conductive material; and a photonic crystal layer disposed on the second electrode, the photonic crystal layer comprising a two-dimensional (2D) grating that has a periodic arrangement of a refractive index, wherein a transmission wavelength band of the photonic crystal layer changes based on an electric field formed in the active layer by electric voltage applied between the first electrode and the second electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A three-dimensional (3D) depth image photographing apparatus, the apparatus comprising:
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a lighting unit which irradiates light onto an object; an objective lens which focuses light reflected from the object; a photonic crystal type light modulator which modulates light transmitted by the objective lens, the photonic crystal type light modulator comprising; a substrate; a first electrode disposed on the substrate and formed of a transparent conductive material; an active layer disposed on the first electrode, wherein a refractive index of the active layer changes according to application of an electric field, the active layer being directly in contact with the first electrode; a second electrode disposed on the active layer, the second electrode being directly in contact with the active layer and formed of a transparent conductive material; and a photonic crystal layer disposed on the second electrode, the photonic crystal layer comprising a two-dimensional (2D) grating that has a periodic arrangement of a refractive index, wherein a transmission wavelength band of the photonic crystal layer changes based on an electric field formed in the active layer by electric voltage applied between the first electrode and the second electrode; a sensor which senses an optical signal modulated by the photonic crystal type light modulator; and an operation unit which calculates depth image information of the object from the signal sensed by the sensor. - View Dependent Claims (13, 14)
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15. A three-dimensional (3D) image acquisition apparatus, the 3D image acquisition apparatus comprising:
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a lighting unit which irradiates light onto an object; an objective lens which focuses light reflected from the object; a first image sensor which forms a color image signal of the object from visible light received from the objective lens; a photonic crystal type light modulator which modulates infrared light received from the objective lens, the photonic crystal type light modulator comprising; a substrate; a first electrode disposed on the substrate and formed of a transparent conductive material; an active layer disposed on the first electrode, wherein a refractive index of the active layer changes according to application of an electric field, the active layer being directly in contact with the first electrode; a second electrode disposed on the active layer, the second electrode being directly in contact with the active layer and formed of a transparent conductive material; and a photonic crystal layer disposed on the second electrode, the photonic crystal layer comprising a two-dimensional (2D) grating that has a periodic arrangement of a refractive index, wherein a transmission wavelength band of the photonic crystal layer changes based on an electric field formed in the active layer by electric voltage applied between the first electrode and the second electrode; a second image sensor which forms a depth image signal of the object from light modulated by the photonic crystal type light modulator; and an image processor which generates a 3D image of the object based on the color image signal and the depth image signal. - View Dependent Claims (16)
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Specification