Abstract
Subwavelength diffraction gratings (SWGs) that possess structural anisotropies larger than the dimensions of a molecule but smaller than the wavelength (λ) of the incident light, behave like uniaxial optical crystals in the static regime i.e. when the grating period Ʌ ≤ λ/10 [1, 2]. The resulting birefringence of such a SWG is termed as form birefringence which is usually much stronger than the birefringence in naturally available crystals [3]. Also, the degree of form birefringence can be widely tailored by changing structural parameters such as the grating period, the fill factor, and the grating depth. Perhaps it is surprising to know that the amount of form birefringence can also be fine tuned by all-optical means.
© 2015 IEEE
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