Photonics Research, 2019, 7 (11): 11001296, Published Online: Oct. 30, 2019
Interference-enhanced optical magnetism in surface high-index resonators: a pathway toward high-performance ultracompact linear and nonlinear meta-optics 
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Fig. 1. Meta-optics based on Si resonators on a plasmonic substrate. (a) Illustration of a unit cell of the metasurface consisting of an array of a - Si : H P = 720 nm D = 450 nm h = 385 nm m × m a - Si : H | H | Q | H | max y – z m = 1
Fig. 2. All-optical ultrafast modulation enabled by critical coupling with the guided resonance of meta-optical systems. (a) Schematic of the unit cell used in numerical simulations. The geometrical parameters are the same as those used in Fig. 1(a) . The ultrafast nonlinear responses of the proposed metasurface are obtained by implementing the theoretical model presented in Ref. [38]. (b) Transient absolute reflectance modulation (Δ R 0.1 mJ / cm 2 Δ R / R
Fig. 3. Polarization sensitive ultrafast modulation based on Si nanodisks with an elliptical cross-section. (a) Schematic of the unit cell used in numerical simulations. The major and minor axes of the elliptical cross-section are 500 and 450 nm, respectively. (b) The cross- and co-polarization reflectance spectra when the metasurface is illuminated by a y x – y Δ R y y Δ R x y 0.1 mJ / cm 2 Δ R y y / R y y Δ R x y / R x y
Fig. 4. Exploiting the magnetic response in individual high-index resonators for excitation of SPPs. (a) Schematic of the meta-optical system that includes a Si cuboid located on a gold substrate. Around the magnetic Mie resonance of the resonator, SPPs primarily propagating along the + y − y y H y = 5 μm E z E H x H l = 400 nm w = 200 nm l = 480 nm w = 240 nm | E z |
Fig. 5. Directional excitation of SPPs using a pair of high-index resonators. (a) Schematic of the meta-optical system for directional generation of SPPs. A y y = − 5 + 5 μm | E z | E | E z | | E z | probe 1 / | E z | probe 2 | E z | 2 Dis = 450 nm | E z | 2 | E z |
Lei Kang, Huaguang Bao, Douglas H. Werner. Interference-enhanced optical magnetism in surface high-index resonators: a pathway toward high-performance ultracompact linear and nonlinear meta-optics[J]. Photonics Research, 2019, 7(11): 11001296.
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