Inverse design of all-dielectric parallel-plane mirror optical resonator

Abstract

In this study, we used parallel plane mirror resonator analogy to design all-dielectric optical resonator that is performed with the objective-first inverse design algorithm. Confinement of the light is succeeded via predefined objective function to create symmetric mirror regions for the fundamental transverse-electric polarization mode. The algorithm creates bandgap in random structure to obtain resonance peak at the desired wavelength without any intuitive scanning of the parameter space. The first order mode is confined on the cavity region at pre-defined wavelength. The obtained structure is analysed by using the two-dimensional finite-difference time-domain method. The proposed structure has a compact configuration with a footprint of 13.394 x 0.592 μm 2 .Recently, various methods of inverse design are extensively studied in photonics since they have great potential to provide plenty of degree of freedoms in structural optimization using large numbers of parameters that is not possible with conventional approaches [18,19]. With this motivation, an effective design approach named as objective-first (OF) inverse design algorithm has been recently proposed along with the implementation of various integrated photonic components exhibiting high performances [20]. Differently from the previously reported approaches, the OF algorithm uses a significantly broad parameter space, and provide higher functionality, design flexibility, effectiveness in terms of computational cost and comparably small footprint size of the device. Furthermore, it is a highly promising technique for manufacturable photonic devices enabled by standard lithography and semiconductor fabrication processes [20,21]. Therefore, in this study, we propose and demonstrate dielectric mirror-based resonator obtained via the approach of the OF inverse design. The paper is organized as follows. Section II explains the targeted design problem and outlines the optimization method. Then Section III shares the numerical results of optical resonators. Finally, Conclusions are given in Section IV.

Zones optimized multilevel diffractive lens for polarization-insensitive light focusing

“…Recently, optimization-based design approaches and socalled inverse design techniques have gathered great attention to the design of highly efficient optical/photonic devices [21][22][23][24][25][26][27][28]. Also, optimization algorithms are applied to design PCs, metasurface, and diffractive lenses where zone heights or radii are optimized to achieve a desired focusing effect [29][30][31].…”