Gradient index lens using effective refractive index of microstructure arranged in radial pattern, and method for manufacturing same
First Claim
1. A gradient index lens using an effective refractive index of a microstructure converging an electromagnetic wave from mid-infrared to terahertz wave, comprising:
- a flat plate type substrate consisting of Si or GaAs and having a predetermined thickness; and
microstructures formed in the substrate to control an effective refractive index of the flat plate type substrate,wherein the microstructures include through-holes arranged in the substrate, the through-holes having a circular shape, a polygonal shape, or a composite shape, the through-holes having a diameter smaller than a wavelength of the electromagnetic wave,wherein each of the through-holes does not enclose one another, andwherein the diameter of the through-holes or an interval therebetween is gradually increased or reduced radially from a center of the substrate such that the refractive index of the microstructure gradually changes radially from the center of the substrate.
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Abstract
Provided are a gradient index lens using the effective refractive index of a microstructure operating in the terahertz frequency regions and mid-infrared regions at wavelengths of 0.8 m to 3 mm and a method for manufacturing the same. Based on the effective medium theorem, the effective refractive index is controlled by using a structure smaller than the mid-infrared and terahertz wavelength, and a gradient can be provided for the refractive index in a radial direction and in an axial direction. Thus, beams in the mid-infrared and terahertz frequency region can be converged.
13 Citations
11 Claims
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1. A gradient index lens using an effective refractive index of a microstructure converging an electromagnetic wave from mid-infrared to terahertz wave, comprising:
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a flat plate type substrate consisting of Si or GaAs and having a predetermined thickness; and microstructures formed in the substrate to control an effective refractive index of the flat plate type substrate, wherein the microstructures include through-holes arranged in the substrate, the through-holes having a circular shape, a polygonal shape, or a composite shape, the through-holes having a diameter smaller than a wavelength of the electromagnetic wave, wherein each of the through-holes does not enclose one another, and wherein the diameter of the through-holes or an interval therebetween is gradually increased or reduced radially from a center of the substrate such that the refractive index of the microstructure gradually changes radially from the center of the substrate. - View Dependent Claims (2, 3, 4, 10)
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5. A method for manufacturing a gradient index lens using an effective refractive index of a microstructure converging an electromagnetic wave from mid-infrared to terahertz wave, the method comprising:
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providing a flat plate type master substrate consisting of Si or GaAs; forming a mask layer on the master substrate; forming an etch pattern for forming the microstructure having a diameter smaller than a wavelength of the electromagnetic wave on the mask layer; etching the substrate using the patterned mask layer as an etch mask; removing the remaining mask layer; injecting a polymer into the etched substrate; hardening the injected polymer; and separating the hardened polymer from the etched substrate to form a polymer lens in which the microstructure is formed, wherein in the forming of the etch pattern of the microstructure, the etch pattern is formed so that through-holes having a circular shape, a polygonal shape, or a composite shape are arranged in the substrate, the through-holes having a diameter being smaller than the wavelength of the electromagnetic wave, wherein each of the through-holes does not enclose one another, and wherein the diameter of the through-holes or an interval therebetween is gradually increased or reduced radially from a center of the substrate such that the refractive index of the microstructure gradually changes radially from the center of the substrate. - View Dependent Claims (6, 7, 8, 9, 11)
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Specification