Abstract
In this letter, we report a full-metallic broadband wave plate assembled by standing metallic L-shaped stereostructures (LSSs). We show that with an array of LSSs, high polarization conversion ratio is achieved within a broad frequency band. Moreover, by rotating the orientation of the array of LSSs, the electric components of the reflection beam in two orthogonal directions and their phase difference can be independently tuned. In this way, all the polarization states on the Poincaré sphere can be realized. As examples, the functionalities of a quarter wave plate and a half wave plate are experimentally demonstrated with both reflection spectra and focal-plane-array imaging. Our designing provides a unique approach in realizing the broadband wave plate to manipulate the polarization state of light.
Highlights
We report a full-metallic broadband wave plate assembled by standing metallic L-shaped stereostructures (LSSs)
We show that with an array of LSSs, high polarization conversion ratio is achieved within a broad frequency band
The functionalities of a quarter wave plate and a half wave plate are experimentally demonstrated with both reflection spectra and focal-plane-array imaging
Summary
We should emphasize that a quarter wave plate constructed with LSS array can realize all the polarization states, which can be illustrated clearly with the Poincare sphere.1 On the surface of Poincare sphere, point (2w, 2v) represents a state of polarization, where v is the ellipticity angle as illustrated in the inset of Fig. 2(c) and the angle w represents the direction of the major axis of the ellipse polarized light In the frequency range of 1550–2100 cmÀ1, the phase difference of reflected light in x- and y-directions remains 90.
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