Hyperbolic metamaterial composite grating-enhanced high-frequency quantum-dot single photon source

A compound grating and single photon source technology, applied in the direction of electrical components, circuits, semiconductor devices, etc., can solve the problems of low light emission efficiency and light exit efficiency, and achieve the effect of improving photon generation rate and collection and utilization efficiency

Active Publication Date: 2017-12-08
INST OF ELECTRONICS ENG CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The most critical problem is that most of the spontaneous emission light will diverge into the metamaterial itself, and eventually the ohmic loss of the metamaterial will disappear, resulting in a low coupling efficiency of the emitted light from the surface.
Therefore, in order to realize an effective high-frequency quantum dot single photon source using hyperbolic metamaterials, it is necessary to solve the problem of low light extraction efficiency.

Method used

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  • Hyperbolic metamaterial composite grating-enhanced high-frequency quantum-dot single photon source
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  • Hyperbolic metamaterial composite grating-enhanced high-frequency quantum-dot single photon source

Examples

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Effect test

Embodiment 1

[0031] A visible single photon source with CdSe / ZnS shell colloidal quantum dots located on the surface of a hyperbolic metamaterial composite grating, as follows figure 1 As shown, wherein: the substrate 1 is a Si substrate; the dielectric film 21 in the one-dimensional periodic structure is Al 2 o 3 Dielectric film with a thickness of 10nm; the metal film or metal-like film 22 in a one-dimensional periodic structure is a metal Ag film with a thickness of 8 nm; 2 o 3 The dielectric thin film 21 and the metal Ag thin film 22 form a hyperbolic metamaterial, and the surface is Al 2 o 3 Dielectric film; the air gap 3 is annular, the line width is 125 nm, in Al 2 o 3 / Ag multilayer hyperbolic metamaterial is etched with a period of 250 nm to form a concentric ring grating; quantum dot 4 is a CdSe / ZnS shell colloidal quantum dot with a light emission wavelength of 500 nm, placed at the center of the hyperbolic metamaterial surface of the composite ring grating place.

[0032...

Embodiment 2

[0034] A near-infrared single-photon source with PbS colloidal quantum dots inside a hyperbolic metamaterial composite grating, such as image 3 As shown, wherein: the substrate 1 is a sapphire substrate; the dielectric film 21 in the one-dimensional periodic structure is a Si film with a thickness of 20 nm; the metal film or metal-like film 22 in the one-dimensional periodic structure is a metal-like AZO Thin film with a thickness of 20 nm; the air gap 3 is ring-shaped, and the line width is 387.5 nm. It is etched on the AZO / Si hyperbolic metamaterial with a period of 775 nm to form a concentric ring grating; the quantum dot 4 is PbS quantum dots, and the emission wavelength is 1550 nm, placed at the center of the ring grating surface in the Si thin film inside the AZO / Si multilayer hyperbolic metamaterial.

[0035] This structure produces a Purcell factor (Purcell factor) of 150 at the emission wavelength of 500 nm, that is, the spontaneous emission rate is enhanced by 150 t...

Embodiment 3

[0037] A hyperbolic metamaterial composite grating-enhanced self-assembled InAs quantum dot electrically pumped single-photon source, such as Figure 4 As shown, wherein: the substrate 1 is a GaAs substrate; the bottom of the substrate 1 is provided with SiO 2 Anti-reflection film 12 with a thickness of 150 nm; the dielectric film 21 in the one-dimensional periodic structure is TiO 2 A dielectric thin film with a thickness of 15 nm; the metal thin film or metal-like thin film 22 in the one-dimensional periodic structure is a metal Au thin film with a thickness of 15 nm; a ring grating is formed by etching on the pin structure GaAs thin film 51 with an air gap line width of 150 nm, the ring grating period is 450 nm, and spin-on-glass SOG 32 is filled in the gap groove of the ring grating; the quantum dot 4 is a self-assembled InAs quantum dot, and the light emission band is 900 nm; the pin structure GaAs thin film 51, the thickness is 300 nm; the GaAs lining An n-type electrod...

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Abstract

The invention discloses a hyperbolic metamaterial composite grating-enhanced high-frequency quantum-dot single photon source. The hyperbolic metamaterial composite grating-enhanced high-frequency quantum-dot single photon source comprises a substrate, a hyperbolic metamaterial and quantum dots, wherein a grating microstructure is arranged on a surface of the hyperbolic metamaterial or in the hyperbolic metamaterial, the hyperbolic metamaterial is of a one-dimensional periodic structure formed by alternatively arranging dielectric thin films and metal thin films or the dielectric thin films and metal-like thin films, and the quantum dots are arranged in the one-dimensional periodic structure or a near field of the hyperbolic metamaterial. Spontaneous radiation enhancement of wideband of the quantum dots is achieved by the hyperbolic metamaterial, the light emergent efficiency is improved by simultaneously combining directional coupling output characteristic of the grating, the photon generation ratio and the collection and utilization ratio of the quantum-dot single photon source are greatly improved, and the high-frequency, high-brightness and directional-emission quantum-dot single photon source of GHz or above can be achieved; and meanwhile, two excitation modes of optical pumping and electric pumping are compatible, and the quantum-dot single photon source is suitable for various wave bands to an infrared band from an ultraviolet band and can be widely applied to related fields of quantum information, quantum computation, quantum imaging, quantum authentication and quantum precision measurement.

Description

technical field [0001] The invention relates to the fields of single photon sources, metamaterials, and micro-nano photons, and specifically refers to a high-frequency quantum dot single photon source enhanced by a hyperbolic metamaterial composite grating. Background technique [0002] Single photon sources not only play an important role in quantum information processing, quantum secure communication, quantum radar and quantum optical computing, but also have important application value in the fields of micro absorption measurement, ultra-high sensitivity magnetic field measurement, bioluminescent labeling and imaging. Among many single-photon emission generation schemes, the single-photon source based on quantum dots has great advantages in all aspects compared with other single-photon sources, such as narrow spectral line width, high oscillator intensity, and no photofading. Or flickering, small time jitter, high repetition frequency, emission band can cover various band...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L33/06H01L33/24
CPCH01L33/06H01L33/24
Inventor 陈飞良李沫张晖黄锋李倩张健
Owner INST OF ELECTRONICS ENG CHINA ACAD OF ENG PHYSICS
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