In this paper, we propose a microcavity supported by a designed photonic crystal (PhC) structure that supplies both tunability of cavity modes and cavity's quality factor. Low symmetric defect region provides a trigger effect for the frequency shifting by means of rotational manipulation of small symmetry elements. Deviation of effective filling ratio as a result of rotational modification within the defect region results in the emanation of cavity modes at different frequencies. Here, we numerically demonstrate the frequency shifting for each obtained mode with respect to defect region architecture. In addition to wavelength tunability, quality factor, mode volume, and Purcell factors are analyzed for the slightly modified structures. Also, electric field distributions of each mode that emerge at distinct frequencies have been also studied at adjusted frequency modes which are observed for all rotational modification scenarios as = [0°, 15°, 30°, 45°]. After the investigations in 2D of silicon material (ɛ = 12), 3D simulations are performed and the collected data is used for the stacking approximation of 3D structures to get the 2D, thus the crosschecking of the quality factor that acquired from the 2D simulation can be executed by comparison with 3D. Limited 3D results are projected to approximate 2D ones step by step and get an exponential trend which reaches in the limit to the ~10 8 value for Ԛ-factor. Besides, 2D and 3D simulations of alumina (ɛ = 9.61) in terms of mode analysis and quality factor have been repeated considering the microwave experiments. Therefore, experimental analysis is compared with the numerical results and good agreement between the two is found.
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.
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