Manipulating the Orientations of the Electric and Magnetic Dipoles Induced in Silicon Nanoparticles for Multicolor Display

Abstract

Artificial control of colors based on plasmonic and dielectric nanostructures is not only interesting for fundamental research, but also important for practical applications. Apart from spatial resolution, chromaticity, angular independence, and dynamical color-tuning have emerged as the most desirable functions for structural color. Here, it is shown theoretically that the orientations of the electric or magnetic dipoles induced in a silicon nanoparticle can be manipulated by using an evanescent wave excited by sor p-polarized light, and it is experimentally demonstrated that the scattering light color can be controlled by simply varying the polarization of the illumination light. It is revealed that the excitation of a silicon nanoparticle using an evanescent wave is equivalent to that of using both the incident and reflected light, enabling the manipulation of the scattering light color by controlling the orientations of the electric and magnetic dipoles. In addition, an enhanced scattering light intensity and a completely dark background are achieved by using evanescent wave excitation. More importantly, a color-tuning display with a spatial resolution close to the optical diffraction limit, and a good chromaticity on an array of silicon nanopillars fabricated on a silica substrate is demonstrated, which are compatible with the current fabrication technology of silicon chips.

Liquid Gallium Nanospheres Emitting White Light

“…Recently, it has been demonstrated that femtosecond laser ablation can be employed to fabricate semiconductor nanoparticles, such as silicon (Si) NSs which exhibit distinct electric and magnetic resonances in the visible to near‐infrared spectral region . Based on Mie theory and the complex refractive index reported for liquid Ga, one can expect that the ED and electric quadrupole (EQ) resonances of a liquid Ga NS will be shifted from the ultraviolet to visible light and even near‐infrared spectral region with increasing diameter of the liquid Ga NS (see , Supporting Information).…”

All-silicon-based nano-antennas for wavelength and polarization demultiplexing

“…More interestingly, we show that a nano-antenna array composed of regularly arranged nano-antennas can be employed to steer the propagation direction of light beams with large diameters when the diffractions of the array are intentionally designed to be coincide with the deflection angles of single nano-antennas. For practical applications, the all-silicon nano-antennas sitting on a quartz substrate can be experimentally fabricated by using the techniques of wafer bonding, electron-beam lithography and reactive ion etching [55]. Apart from the wavelength and polarization demultiplexers proposed in this work, such nano-antennas may find possible applications in single photon emitters.…”

Tailoring the spatial localization of bound state in the continuum in plasmonic-dielectric hybrid system

“…In principle, Mie resonances in dielectric nanoparticles with large refractive indices can be employed to release the Ohmic loss [6][7][8][9]. Although an improvement of Q factor can be achieved in such a wavelength scale nanoparticles, because of its dielectric nature, the realization of high Q factor resonance is still hindered by the radiation loss of corresponding electromagnetic multipole modes (i.e.…”