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Bound states in the continuum supported by silicon oligomer metasurfaces

Bing Meng, Jianfu Wang, Chaobiao Zhou, and Lujun Huang

Open Access Open Access

Abstract

Oligomer metasurfaces have attracted a lot of attention in recent years because of their ability to drive strong resonance effects. In this work, by perturbing the symmetry of the structure, we find that there are a large number of resonance modes in the oligomer metasurfaces associated with the optical bound states in the continuum (BICs) near the communication wavelength. When the positions of two nanodisks of the hexamer oligomers are moved along the x- or y-directions at the same time, the mirror symmetry is broken, and an electric quadrupole BIC and three magnetic dipole BICs are excited. The results of near-field distribution of three-dimensional nanodisks and far-field scattering of multiple dipoles in each quasi-BIC reveal that the four BICs present different optical characteristics. It is noted that the method of symmetry breaking by moving the position of nanodisks can accurately control the asymmetric parameter of symmetry-protected BICs, which provides a route for the realization of ultrahigh quality (Q)-factor oligomer metasurfaces in experiment.

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Supplementary Material (1)

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Supplement 1       Supplemental Document

Data availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Figures (4)
Fig. 1.
Fig. 1. (a) Top view of moved nanodisks D1 and D4, $a$ is the distance the nanodisks move. (b) Transmission spectra as functions of wavelength and parameter $a$. (c) Transmission spectra for $a=0$ and $a=100$ nm. $Q$-factors of (d) QBIC-1 and (e) QBIC-2 as functions of parameter $a$.

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Fig. 2.
Fig. 2. Scattered power of different multipole moments for (a) QBIC-1 and (d) QBIC-2. Dashed-dotted curves, EQ; long dashed curves, MD; short dashed curves, MQ, top solid curve, ED; bottom solid curve, TD. Electric and magnetic field distributions for (b),(c) QBIC-1 and (e),(f) QBIC-2.

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Fig. 3.
Fig. 3. (a) Top view of moved nanodisks D2 and D3. (b), (c) Transmission spectra and $Q$-factors of oligomer metasurfaces under different $a$ values. (d) Far-field scattering energy of different multipole moments for QBIC-3. Dashed-dotted curves, EQ; long dashed curves, MD; short dashed curves, MQ, top solid curve, ED; bottom solid curve, TD. (e), (f) Distribution of electric and magnetic fields.

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Fig. 4.
Fig. 4. (a) Schematic of moving nanodisks D3 and D5, where $a$ is the distance the disks move. (b) Transmission spectra corresponding to the change of $a$ from $-120$ nm to 120 nm. (c) $Q$-factor of QBIC-4 changing with parameter $a$. (d) Transmission spectrum and scattered radiation contributions of different multipole moments at $a=100$ nm. Key same as in Fig. 3. (e), (f) Electric and magnetic field distribution of nanodisks at resonance wavelength when $a$ is 100 nm.

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Equations (2)

Equations on this page are rendered with MathJax. Learn more.

Q ∝ α − 2 ,
Q ∝ a − 2 ,
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