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Optical device structure unit of visible light wave band transform and optical device

A technology of optical devices and structural units, applied in the field of integrated optics, can solve problems such as limiting the working efficiency of metasurfaces, and achieve the effects of high availability and high abnormal reflection conversion efficiency

Inactive Publication Date: 2016-10-26
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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Problems solved by technology

Although this kind of scheme avoids the complicated level of preparation, the working efficiency of the metasurface composed of this metal is still limited due to the ohmic loss of the metal.

Method used

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  • Optical device structure unit of visible light wave band transform and optical device
  • Optical device structure unit of visible light wave band transform and optical device
  • Optical device structure unit of visible light wave band transform and optical device

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Embodiment Construction

[0028] The preferred embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0029] In view of the shortage of the existing transformation optical devices in the working band, in order to realize the abnormal reflection in the visible light band, a metasurface with a periodic structure of titanium dioxide is used. The surface material has a better experimental effect, and it makes the structure more complete in the demasking stage after reactive ion beam etching in the experiment. The working band of this design is in the visible light band, but the design can be extended to other wavelength ranges. In this design, titanium dioxide is used as the material of the dielectric resonant antenna, and the optical performance of the high refractive index of titanium dioxide is used to make the nano-optical antenna have the phase performance of regulating the scattered light. Dielectric metamaterial resonant anten...

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Abstract

The present invention provides an optical device structure unit of visible light wave band transform and an optical device. The optical device structure unit of visible light wave band transform comprises an antenna formed by a TiO2 material, a silver mirror, and a silicon dioxide substrate, wherein an antenna structure is at a top layer, the silver mirror is in the middle, and a silicon dioxide substrate material is at the bottom, the width size a of the antenna is between 160nm and 180nm, the length size b of the antenna is between the 240nm and 370nm, the lengths and widths of the silver mirror and the silicon dioxide substrate are the same and are recorded as P, a period P=430+ / -10nm, the thickness t1 of the antenna structure is 240+ / -5nm, and the solver layer thickness t2 of the silver mirror is 300+ / -20nm. According to the optical device, a TiO2 nano antenna is used as the basic structure unit, a metasurface sub unit perfectly realizes beam abnormal reflection at the wavelength of 632nm, and the formed optical device has a high abnormal reflection conversion efficiency.

Description

technical field [0001] The invention belongs to the technical field of integrated optics, and in particular relates to a structural unit of an optical device for visible light band conversion and an optical device. Background technique [0002] Traditional optical elements such as plane mirrors, prisms, lenses, etc., and diffractive structures such as gratings change the propagation direction of the beam through the accumulation of continuous phases on the propagation path. The distance that waves propagate in optical elements is generally much longer than the wavelength. When an electromagnetic wave is incident on the interface between two media, the reflected wave and the transmitted wave obey the classic law of reflection and refraction (Snell's Law, Snell's Law). Research on metamaterials, especially left-handed materials, has shown that using left-handed materials can also cause abnormal reflection of incident waves, but it still obeys the classical law of refraction, b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B1/00G02B5/30
CPCG02B1/002G02B5/3083
Inventor 肖淑敏朱茂霞张海涛宋清海
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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