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Non-reciprocity dual-channel narrow-band filter of non-magnetic photonic crystal

A technology of narrow-band filters and photonic crystals, applied in light guides, optics, instruments, etc., can solve problems such as weak magneto-optical effects and increased structural complexity, and achieve the effects of low transmission loss, simple modulation method, and small device size

Pending Publication Date: 2022-04-12
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

The other is to combine magneto-optical materials with photonic crystals to achieve optical rotation under the action of an external DC magnetic field. No
Moreover, the combination of magnetic materials and non-magnetic materials realizes the non-reciprocal transmission function, and the structural complexity increases.

Method used

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  • Non-reciprocity dual-channel narrow-band filter of non-magnetic photonic crystal
  • Non-reciprocity dual-channel narrow-band filter of non-magnetic photonic crystal
  • Non-reciprocity dual-channel narrow-band filter of non-magnetic photonic crystal

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solution of the present invention more clearly, but not to limit the protection scope of the present invention.

[0032] Such as figure 1 As shown, this example provides a non-magnetic photonic crystal non-reciprocal dual-channel narrowband filter, including a vertical input main waveguide (waveguide 1 in the figure), two horizontal output waveguides (waveguide 2 and waveguide 3 in the figure) , a microcavity; the microcavity includes a dielectric column inside the microcavity and a dielectric column outside the microcavity (M in the figure is a dielectric column outside the microcavity).

[0033] The filter in this embodiment only destroys the structural symmetry of the photonic crystal, and realizes the optical non-reciprocal transmission function by using whether the modes match when the waveguide and t...

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Abstract

The invention discloses a non-reciprocity dual-channel narrow-band filter of a non-magnetic photonic crystal. The non-reciprocity dual-channel narrow-band filter comprises a vertical input main waveguide, two horizontal output waveguides and a microcavity formed by rectangular dielectric cylinders. According to the design structure, the spatial structure symmetry of the non-magnetic photonic crystal is destroyed, and non-reciprocity transmission is achieved through odd-even mode matching of the waveguide and the microcavity. And under the condition of positive input, the resonant cavity is coupled with different horizontal output waveguides in different directions, so that dual-channel narrow-band filtering output is realized. Under the condition of reverse input, electromagnetic waves with the same frequency in the same symmetric mode cannot be coupled and output due to the fact that the symmetric mode of the electromagnetic waves is not matched with the waveguide. The two-dimensional photonic crystal non-reciprocity filter is high in transmittance, high in isolation degree and small in size, has the advantages of being simple in structure, low in power consumption, easy to integrate and the like, and has potential application value in a future integrated optical loop.

Description

technical field [0001] The invention relates to a non-magnetic photonic crystal non-reciprocal dual-channel narrow-band filter, which belongs to the field of two-dimensional photonic crystal devices. Background technique [0002] Photonic crystals are good artificial materials to realize optical path regulation. They have the characteristics of photonic band gap and photonic localization. In the design of unidirectional optical transmission devices, photonic crystals are a very good choice. Compared with traditional filters, it has the characteristics of small size, low energy consumption, and easy integration. Therefore, the design and research of photonic crystal filters have great application value in optical communication. So far, research on filters based on photonic crystals has mainly realized the frequency selection function by adjusting the coupling length and structure between waveguides, and changing the coupling structure of point defect resonators and ring cavit...

Claims

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Application Information

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IPC IPC(8): G02B6/122
Inventor 徐聪陈德媛李宜书葛士曾
Owner NANJING UNIV OF POSTS & TELECOMM
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