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CN-224216898-U - Slow light device based on rectangular intermittent graphene metamaterial

CN224216898UCN 224216898 UCN224216898 UCN 224216898UCN-224216898-U

Abstract

The utility model relates to a slow light device based on a rectangular intermittent graphene metamaterial, which comprises a silicon substrate and square-ring continuous graphene, wherein the first rectangular intermittent graphene, the second rectangular intermittent graphene and the third rectangular intermittent graphene are sequentially and uniformly arranged along the front-back direction of the slow light device, the square-ring continuous graphene is of a rectangular frame structure, and the first rectangular intermittent graphene, the second rectangular intermittent graphene and the third rectangular intermittent graphene are respectively arranged on the upper surface of the silicon substrate. The utility model solves the problems of small refractive index and narrow bandwidth of the graphene metamaterial structure slow-light device group, reduces the size of the graphene metamaterial structure slow-light device, and solves the problem that the graphene metamaterial structure slow-light device is not easy to integrate in an on-chip plasmon optical path.

Inventors

  • WANG BOYUN
  • YU HUAQING
  • ZENG QINGDONG

Assignees

  • 湖北工程学院

Dates

Publication Date
20260508
Application Date
20250718

Claims (8)

  1. 1. A slow light device based on rectangular intermittent graphene metamaterial is characterized by comprising a silicon substrate (1), square ring continuous graphene (2), a first rectangular intermittent graphene (3), a second rectangular intermittent graphene (4) and a third rectangular intermittent graphene (5), wherein: The square ring continuous graphene (2) is of a rectangular frame structure, the square ring continuous graphene (2) is arranged on the outer side of the first rectangular continuous graphene (3), the second rectangular continuous graphene (4) and the third rectangular continuous graphene (5) are respectively arranged on the upper surface of the silicon substrate (1), the first rectangular continuous graphene (3), the second rectangular continuous graphene (4) and the third rectangular continuous graphene (5) are sequentially and uniformly arranged along the front-back direction of the slow light device, the square ring continuous graphene (2) is of a rectangular frame structure, the square ring continuous graphene (2) is arranged on the outer side of the first rectangular continuous graphene (3), the second rectangular continuous graphene (4) and the third rectangular continuous graphene (5) at intervals in a surrounding mode, the first rectangular continuous graphene (3), the second rectangular continuous graphene (4) and the third rectangular continuous graphene (5) are respectively and directly coupled with light, and respectively enter the first rectangular graphene (3), the second rectangular continuous graphene (4), the third rectangular continuous graphene (5) and the first rectangular continuous graphene (4), the second rectangular continuous graphene (4) and the first rectangular continuous graphene (4) are excited by the continuous graphene (4) And the third rectangular intermittent graphene (5) is subjected to near-field coupling effect to indirectly excite SPPs on the surface of the square-ring continuous graphene (2).
  2. 2. The slow light device based on rectangular discontinuous graphene metamaterial according to claim 1, wherein the thickness of the silicon substrate (1) is 300 nm.
  3. 3. The slow light device based on the rectangular discontinuous graphene metamaterial according to claim 2, wherein the square-ring continuous graphene (2) is 18 μm in outer side length, 8 μm in outer side width, 16 μm in inner side length and 6 μm in inner side width.
  4. 4. The slow light device based on the rectangular intermittent graphene metamaterial according to claim 3, wherein the side length of each of the first rectangular intermittent graphene (3), the second rectangular intermittent graphene (4) and the third rectangular intermittent graphene (5) is 4.5 μm.
  5. 5. The slow light device based on the rectangular intermittent graphene metamaterial according to claim 4, wherein the distance between the first rectangular intermittent graphene (3) and the second rectangular intermittent graphene (4) is 0.62 μm, and the distance between the second rectangular intermittent graphene (4) and the third rectangular intermittent graphene (5) is 0.62 μm.
  6. 6. The slow light device based on the rectangular discontinuous graphene metamaterial according to claim 5, wherein the thickness of single-layer graphene adopted by the slow light device is 0.2 nm.
  7. 7. The slow light device based on the rectangular intermittent graphene metamaterial according to claim 6, wherein the fermi levels of the square-shaped ring continuous graphene (2), the first rectangular intermittent graphene (3), the second rectangular intermittent graphene (4) and the third rectangular intermittent graphene (5) are all fixed to be 1.1 eV.
  8. 8. The slow light device based on the rectangular discontinuous graphene metamaterial according to claim 7, wherein the slow light device is of a micrometer size.

Description

Slow light device based on rectangular intermittent graphene metamaterial Technical Field The utility model relates to the technical field of optical communication, in particular to a slow light device based on a rectangular intermittent graphene metamaterial. Background In the field of optical communications, with the increase of transmission capacity, the phenomenon of "electronic bottlenecks" existing in optical-electrical-optical data routing and switching modes is more prominent, and has become an important factor for restricting the bandwidth, volume, cost, power consumption and rate of a communication network. In order to break through the "electronic bottleneck", all-optical networks have been developed, which is a necessary trend in the development of communication networks. The all-optical network relies on the capability of generating and controlling data buffering, logic conversion and signal delay, utilizes a slow optical device to delay and buffer signals, can avoid the problems of large volume, complex structure and the like of the traditional optical fiber delay line, and can realize tunable delay. Slow light means that the group velocity of the light pulses propagating in the medium is less than the velocity of light in vacuum. In all-optical communication network and all-optical signal processing, the slow optical device is a key node device for constructing the next generation information technology such as all-optical intelligent interconnection, real-time high-speed control and the like. With the rapid development of integrated slow optical devices based on key technologies such as signal delay, data buffering and exchange, the requirements of small size, large delay, wide bandwidth and dynamic tunability of slow optical devices in a mid-infrared band are more and more obvious, so that the realization of slow optical devices with compact device size, large group refractive index, wide bandwidth, dynamic tunability and easy integration of new working mechanisms is very important, and the application of the novel slow optical devices in data routing, signal delay, data buffering and exchange technologies of all-optical communication networks and signal processing is more and more extensive. Surface plasmons (Surface Plasmon Polaritons, SPPs for short) are a type of surface electromagnetic evanescent wave that propagates along a metal-dielectric interface and decays exponentially in the direction perpendicular to the metal surface. SPPs have the characteristics of breaking through the traditional optical diffraction limit and enhancing the strong local optical field, so that the guidance and the control of light in the sub-wavelength level can be realized. SPPs can be used as a carrier of energy and information, and have important application value in high-density integrated photon circuits. Currently, SPPs-based slow-light devices, such as metamaterial and super-surface structure based slow-light buffers, have been widely studied. Since SPPs have strong local optical field enhancement characteristics and can overcome conventional diffraction limits, slow-light devices based on SPPs have small structural dimensions and wide bandwidths. The propagation direction of SPPs is parallel to the surface of the device, and the integration and design of chips are easy. Thus, it is a trend in the future to realize SPPs metamaterial slow-light devices with compact device size, large group refractive index, wide bandwidth, dynamic tunability, and easy integration. Currently, SPPs slow light devices based on plasmon-induced transparency (Plasmon Induced Transparency, abbreviated as PIT) effect are attracting more and more attention. The generation of the PIT phenomenon is similar to the electromagnetic induction transparent (Electromagnetically Induced Transparency, EIT) effect in atomic gas, but compared with the EIT phenomenon in atomic gas, which is determined by the absorption characteristics of materials, the EIT-like phenomenon generated by the geometric structure of the resonant cavity coupled plasma waveguide system has a wider application prospect due to the characteristics of being capable of operating at room temperature, chip integration compatibility, transmission band tunability, bandwidth controllability and the like. In the metamaterial structure, PIT effect is generated by utilizing mutual coupling interference between a bright mode and a dark mode, so that slow light is realized. Because the PIT effect transparent peak has the characteristics of large quality factor, steeper transmission spectrum, large group delay caused by strong dispersion and the like, the PIT effect is suitable for being applied to slow light devices. In recent years, graphene, a two-dimensional material with a single carbon atom layer, provides a novel and low-loss way for limiting and controlling SPPs, and is widely applied to the design of SPPs devices. Considering the unique properties of graphene, graphene-ba