Tuning subwavelength-structured focus in the hyperbolic metamaterials

In this paper, we have systematically investigated light propagating in the hyperbolic metamaterials (HMMs) covered by a subwavelength grating. Based on the equal-frequency contour analyses, light in the HMM is predicted to propagate along a defined direction because of its hyperbolic dispersion, which is similar to the self-collimating effects in photonic crystals. By using the finite-difference time-domain, numerical simulations demonstrate a subwavelength bright spot at the intersection of the adjacent directional beams. Different from the images in homogeneous media, the magnetic fields and electric fields at the spot are layered, especially for the electric fields Ez that is polarized to the propagating direction, i.e., the layer normal direction. Moreover, the Ez is hollow in the layer plane and is stronger than the other electric field component Ex. Therefore, the whole electric field is structured and its pattern can be tuned by the HMM’s effective anisotropic electromagnetic parameters. Our results may be useful for generating subwavelength structured light.

[1]  Guixin Li,et al.  Subwavelength focusing using a hyperbolic medium with a single slit. , 2011, Applied optics.

[2]  Zhaowei Liu,et al.  A super resolution metalens with phase compensation mechanism , 2010 .

[3]  Changtao Wang,et al.  Subwavelength focusing of light in the planar anisotropic metamaterials with zone plates. , 2010, Optics express.

[4]  Changtao Wang,et al.  Subwavelength imaging with anisotropic structure comprising alternately layered metal and dielectric films. , 2008, Optics express.

[5]  D. Tsai,et al.  Directed subwavelength imaging using a layered metal-dielectric system , 2006, physics/0608170.

[6]  Michael Scalora,et al.  Negative refraction and subwavelength imaging using transparent metal-dielectric stacks , 2006 .

[7]  V. Podolskiy,et al.  Highly confined optical modes in nanoscale metal-dielectric multilayers , 2007, physics/0703137.

[8]  M. Majewski,et al.  Optical properties of metallic films for vertical-cavity optoelectronic devices. , 1998, Applied optics.

[9]  D. Sarid.  Long-Range Surface-Plasma Waves on Very Thin Metal Films , 1981 .

[10]  Steven M. Block,et al.  Making light work with optical tweezers , 1992, Nature.

[11]  Seunghoon Han,et al.  Loss-compensated and Active Hyperbolic Metamaterials References and Links , 2022 .

[12]  Seyedeh Mehri Hamidi,et al.  Adjustable surface plasmon resonance with Au, Ag, and Ag@Au core-shell nanoparticles , 2014 .

[13]  Shutian Liu,et al.  Chromatic aberration of light focusing in hyperbolic anisotropic metamaterial made of metallic slit array. , 2012, Optics express.

[14]  Dylan Lu,et al.  Hyperlenses and metalenses for far-field super-resolution imaging , 2012, Nature Communications.

[15]  Xiang Zhang,et al.  All-angle negative refraction and imaging in a bulk medium made of metallic nanowires in the visible region. , 2008, Optics express.

[16]  S. Chu,et al.  Observation of a single-beam gradient force optical trap for dielectric particles. , 1986, Optics letters.

[17]  Yuncai Feng Yuncai Feng,et al.  Surface waves at the interface of superconductor media and nonlinear metamaterials , 2015 .

[18]  Min Zhong.  Influence of dielectric layer on negative refractive index and transmission of metal-dielectric-metal sandwiched metamaterials , 2014 .

[19]  Munazza Zulfiqar Ali,et al.  Global transmission diagrams for evanescent waves in a nonlinear hyperbolic metamaterial , 2015 .

[20]  J. Pendry,et al.  Imaging the near field , 2002, cond-mat/0207026.

[21]  Vladimir P. Drachev,et al.  Diffractive nanoslit lenses for subwavelength focusing , 2012 .

[22]  S. Thongrattanasiri,et al.  Hypergratings: nanophotonics in planar anisotropic metamaterials. , 2008, Optics letters.

[23]  K. V. Sreekanth,et al.  Large spontaneous emission rate enhancement in grating coupled hyperbolic metamaterials , 2014, Scientific Reports.

[24]  Evgenii E. Narimanov,et al.  Zeroth-order transmission resonance in hyperbolic metamaterials , 2013, CLEO 2013.

[25]  Carlos Bustamante,et al.  Recent advances in optical tweezers. , 2008, Annual review of biochemistry.

[26]  Changbao Ma,et al.  Extraordinary light focusing and Fourier transform properties of gradient-index metalenses , 2011 .