Tunable subwavelength slit lenses based on the manipulation of refractive index of medium

Wanlin Xie; Junbo Yang; DIngbo Chen; Jingjing Zhang; Zhaojian Zhang; Siyu Xu

doi:10.1117/12.2547734

18 December 2019 Tunable subwavelength slit lenses based on the manipulation of refractive index of medium

Wanlin Xie, Junbo Yang, DIngbo Chen, Jingjing Zhang, Zhaojian Zhang, Siyu Xu

Proceedings Volume 11336, AOPC 2019: Nanophotonics; 113360L (2019) https://doi.org/10.1117/12.2547734
Event: Applied Optics and Photonics China (AOPC2019), 2019, Beijing, China

Abstract

A nanoslit array is introduced on the silicon waveguide, and the phase difference is controlled by the slit width to satisfy the function of the focusing lens. If keep the designed width and depth of the slit in accordance with the focusing effect unchanged, when the incident wavelength changes, the focal position must change accordingly, and the dispersion effect is significant. In order to achieve the achromatic effect, the refractive index of the surrounding medium is changed while changing the wavelength. Finally, the refractive index of the surrounding medium which can keep the focal length constant at the wavelength of 1550-1950nm is obtained, and the equation that the change of the refractive index and the wavelength of the medium makes the focal length constant is obtained. The achromatic effect can be effectively achieved, and applications range of achromatic metalens from imaging in optical communications to telescopes in the astronomical field.

Citation Download Citation

Wanlin Xie, Junbo Yang, DIngbo Chen, Jingjing Zhang, Zhaojian Zhang, and Siyu Xu "Tunable subwavelength slit lenses based on the manipulation of refractive index of medium", Proc. SPIE 11336, AOPC 2019: Nanophotonics, 113360L (18 December 2019); https://doi.org/10.1117/12.2547734

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