Abstract
A novel zero-order resonator has been designed by an optical surface transformation (OST) method. The resonator proposed here has many novel features. Firstly, the mode volume can be very small (e.g. in the subwavelength scale). Secondly, the resonator is open (no reflecting walls are utilized) and resonant effects can be found in a continuous spectrum (i.e. a continuum of eigenmodes). Thirdly, we only need one homogenous medium to realize the proposed resonator. The shape of the resonator can be a ring structure of arbitrary shape. In addition to the natural applications (e.g. optical storage) of an optical resonator, we also suggest some other applications of our novel optical open resonator (e.g. power combination, squeezing electromagnetic energy in the free space).
Highlights
Cavities/resonators have been widely utilized to confine electromagnetic energy[1,2]
A closed loop is formed if we connect S1 and S2 together. (d) another way to design an optical resonator by the optical surface transformation (OST): S1 and S2 have been linked by the optic-null medium (ONM)
A novel optical zero-order resonator has been designed by OST in this paper
Summary
Cavities/resonators have been widely utilized to confine electromagnetic energy[1,2]. The mode volume and the quality factor Q are two important properties of an optical cavity/resonator, reflecting its ability to confine the light in the spatial domain and the time domain, respectively. V. Ginis’s group has used TO to design many novel optical cavities that can confine the light on a subwavelength scale with an extremely high Q factor[9,10]. Many different types of coordinate transformations have been given in their studies, and the theory on how to design an optical cavity/resonator with an unlimited quality factor and subwavelength mode volume by the coordinate transformations is available. If we connect S1 and S1’, S2 and S2’ together, respectively, a closed loop filled with the ONM has been created Such closed loop performs like an optical open resonator. The orange and green regions labeled by ‘X’ and ‘Y’ stand for the ONM with main axis along the x and y directions, respectively
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