To identify the object edges and corners, silicone rubber embedded with a fiber Bragg grating (FBG) sensor is used as the manipulator skin. The Bragg wavelength-shift of FBG appears under axial strain. The strain distribution in the skin is analyzed by the simulation of edge and corner contact. The contact situation is determined by the observation of the wavelength-shifts and power changes of the FBG. This method can help identify and distinguish object edges and corners. This method has a wide range of potential applications and can be used for robot tactile sensing. It is beneficial to the advancement of bionics.
Here we propose a metasurface consisting of asymmetric dielectric tetramer arrays, which can realize a polarization-sensitive light modulation through toroidal dipole resonance (TDR) in the near-infrared (NIR) region. We found, by breaking the C4v symmetry of the tetramer arrays, two narrow-band TDRs can be created with the linewidth around 1.5 nm. Multipolar decomposition of scattering power and electromagnetic field distribution calculations confirm the excitation of TDRs. Our simulation results show that 100% modulation depth in light absorption and selective field confinement can be achieved by changing the polarization orientation of the incident light. Our findings will prompt versatile applications in optical switching, storage, polarization detection, and light emitting devices.
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