Abstract
Steering electromagnetic scattering by subwavelength objects is usually accompanied by the excitation of electric and magnetic modes. The Kerker effect, which relies on the precise overlapping between electric and magnetic multipoles, is a potential approach to address this challenge. However, fundamental limitations on the reconfigurability and tunability challenge their future implementation in practical applications. Here, we demonstrate a design approach by applying coherent control to a silicon nanodisk. By utilizing an experimentally feasible two-wave excitation, this coherent light-by-light control enables a highly reconfigurable, broadband, and tunable transverse scattering, extending the feasibility of unidirectional scattering in various practical scenarios, including on-chip integrations and optical communications.
Highlights
Precise control over the scattering property of subwavelength nanostructure lies at the heart of nanotechnology [1,2]
We carry out finite-difference time-domain (FDTD) method (Lumerical Inc., Vancouver, BC, Canada) to validate the theoretical predictions
Have proposed anfrom experimentally feasible approach to continuously manipulate the we transverse scattering a single silicon nanodisk, showing numerically manipulate the transverse scattering from a single silicon nanodisk, showing numerically that a highly reconfigurable and broadband unidirectional scattering can be obtained by that a highly reconfigurable andhave broadband unidirectional scatteringexcitation can be obtained by coherent control method
Summary
Precise control over the scattering property of subwavelength nanostructure lies at the heart of nanotechnology [1,2]. We apply coherent control to a silicon nanodisk and demonstrate a continuously tune the optical response of a static nanostructure noninvasively [14,15,18,19], highly reconfigurable, broadband, and tunable transverse scattering utilizing enabling a variety of applications in ultrafast and nonlinear optics such as without displacement higher‐order multipoles. To overcome this fundamental limitation, coherent electric andthe magnetic dipolar polarizabilities, which cannot always be precisely matched radially andthe azimuthally polarized beams with orthogonal incidence are investigated to fulfilled latter two conditions In this case, the ED mode of a nanosphere can only be excited by are focused radially[16].
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