研究目的
Investigating the design of ultracompact low-pass modal filters based on shortcuts to adiabaticity for integrated optics applications.
研究成果
The optical version of the shortcut to adiabaticity protocol is effective for designing low-pass modal filters in integrated optics, offering substantial improvements in compactness and higher order mode rejection over a broad wavelength range.
研究不足
The study is limited to TE polarization in slab waveguides, and the practical implementation of the designed filters requires advanced fabrication techniques.
1：Experimental Design and Method Selection:
The study employs the shortcut to adiabaticity (STA) protocol for designing photonic ultracompact low-pass modal filters. The method is applied to any two-dimensional multimode optical waveguide.
2：Sample Selection and Data Sources:
A two-dimensional step-index waveguide with core and cladding refractive indexes n1 and n2, respectively, is considered for TE polarization.
3：List of Experimental Equipment and Materials:
The study uses numerical simulations based on the finite-element method (FEM) to corroborate the design.
4：Experimental Procedures and Operational Workflow:
The STA optical potential is synthesized to compensate for nonadiabatic terms in the full-wave propagation of a given mode across ultracompact tapered sections.
5：Data Analysis Methods:
Full-vectorial FEM numerical simulations are performed to analyze light propagation and modal transmission spectrum.
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