By expanding the reconstruction-equivalent-chirp (REC) technique into two-Dimensional (2D) grating, we designed a three-wavelength mode converter with three-cascaded tilted sampled Bragg gratings (3C-TSBG). Theoretical simulation results show that the presented 3C-TSBG can realize three-wavelength conversion between the fundamental transverse electric mode (TE0) and the first-order transverse electric mode (TE1). In addition, the mode-conversion wavelength can be tuned by changing the period and tilted angle of the cascaded sampled gratings. More importantly, compared with the cascaded tilted Bragg gratings (C-TBG), the 3C-TSBG can improved the error tolerance and wavelength control accuracy. Therefore, the proposed 3C-TSBG has potential applications in reconfigurable mode-division-multiplexing communication systems and other areas where programmable mode conversion is required.
A photonic nanojets (PNJs) is a highly confined light beam that focuses from the shadow side of microparticles. In this simulation work, we report the realization of a tunable PNJ, which is formed by an engineered two-layer dielectric microcylinder. The key parameters, maximum intensity, length of PNJ and full-width at half maximum (FWHM), of photonic nanojets (PNJs) are studied. Finite difference time-domain (FDTD) analysis shows that under 400nm illumination, a PNJ with a high quality factor of 145.78 is achieved. We find that the photonic nanojets can be tuned by changing the distance between two layers of dielectric microcylinder. Because of its simple structure and flexibility, it has potential applications in optical imaging, nanolithography, and nanoparticle manipulation.
A photonic nanojets (PNJs) is a highly confined light beam that focuses from the shadow side of microparticles. In this simulation work, we report the realization of a tunable PNJ, which is formed by an engineered two-layer dielectric microcylinder. The key parameters, maximum intensity, length of PNJ and full-width at half maximum (FWHM), of photonic nanojets (PNJs) are studied. Finite difference time-domain (FDTD) analysis shows that under 400nm illumination, a PNJ with a high quality factor of 145.78 is achieved. We find that the photonic nanojets can be tuned by changing the distance between two layers of dielectric microcylinder. Because of its simple structure and flexibility, it has potential applications in optical imaging, nanolithography, and nanoparticle manipulation.
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