Abstract
High‐contrast subwavelength grating (HCG) and distributed Bragg reflector (DBR) are demonstrated to be able to tailor the dispersion independently. Herein, it is found that multiple‐shape dispersions can be realized by a metastructure, which consists of an HCG on the DBR. Such a simple structure exhibits the linear dispersions with band‐edge modes, the M‐shaped dispersion with a cavity mode, and the W‐shaped dispersion with a bound state in the continuum. The origins of these dispersions and the mode characteristics (field distribution and quality factor) in the dispersions are studied. This study is helpful to realize single‐mode high‐efficiency surface‐emitting lasers, optical sensors, and quantum electrodynamics.
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