Metal–dielectric metamaterials for transformation-optics and gradient-index devices in the visible regime

Abstract

We investigate the application of metamaterials made of dielectrics with embedded metal nanoparticles for transformation-optics and gradient-index devices. We demonstrate that the permittivity and permeability distribution required for cylindrical cloaking at optical frequencies can be obtained by a composite material made of silver spheres embedded in a PMMA host. We show that this approach can be applied also to devices with an isotropic permittivity distribution and illustrate this for the optical black hole. The key ingredient of our system is the tunability of the plasmonic interactions between the metallic nanoparticles, depending on distance and size. In addition, we discuss possible realizations of the proposed structures.

Engineered nano-sphere array of gold-DNA core–shells and junctions as opto-plasmonic sensors for biodetection

“…11 The optic transformer is considered for determining the effective permittivity of each layer of the optical cloak. 12 Moreover, the plasmonic behavior of nanoparticles is essential for designing a cloak layer. 13,14 The plasmonic characteristic has also been considered for various optical devices, such as nanoantenna 15,16 and optical absorber for spectroscopy applications.…”

“… 11 The optic transformer is considered for determining the effective permittivity of each layer of the optical cloak. 12 …”

Nanocomposite Multilayer Structure for Broadband MIR Negative Refractive Index

“…Structures based on random distribution of two and three layer spherical nanoparticles in vacuum host have been proposed in visible, near infrared and terahertz regions [6][7][8]. Media with random distribution of metallic spheres and nanorods in the polymeric media are applicable in invisibility [9,10]. On the other hand, multilayer waveguides are important in design of biosensors and filters [11,12].…”

Invisibility cloaks from forward design to inverse design

“…Metamaterials [19,20] can be realized by a collection of artificial "atoms" whose size and spacing are much smaller than the electromagnetic wavelength. These subwavelength periodic elements play similar roles as atoms or molecules in natural homogenous medium and a collection of these artificial elements give a macroscopic electromagnetic response characterized by unusual properties [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40]. Therefore, metamaterials can be used in lots of novel designs, including invisibility cloaks [41].…”