High-performance compact spectrometer based on multimode interference in a tapered spiral-shaped waveguide | Zendy

Meng Fan | Zendy; Yue Zhao | Zendy; Hui Wang | Zendy; Yunzuo Zhang | Zendy

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High-performance compact spectrometer based on multimode interference in a tapered spiral-shaped waveguide

Author(s) -

Meng Fan,

Yue Zhao,

Hui Wang,

Yunzuo Zhang

Publication year - 2019

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.27.038349

Subject(s) - optics , broadband , bandwidth (computing) , multi mode optical fiber , spectrometer , detector , physics , spiral (railway) , waveguide , interference (communication) , amplitude , optical fiber , telecommunications , computer science , mathematical analysis , channel (broadcasting) , mathematics

Multimode interference patterns are strongly dependent on spectral components and can be used as fingerprints to reconstruct a spectrum with random amplitudes. Motivated by this concept, we designed and realized a high-performance compact spectrometer based on a tapered spiral-shaped waveguide with a detector array integrated directly on top. The device relies on imaging the multimode interference from leaky modes, resulting in a resolution of 20 pm in the visible range and a bandwidth from 545 to 725 nm with a 250 µm radius structure. Spectra of multiple narrow lines and synthesized broadband are well reconstructed. The ability to achieve such high resolution and broad bandwidth in a compact footprint is expected to have a significant role in low-cost and multifunctional integrated systems.

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