Broad angle negative refraction in lossless all dielectric or semiconductor based asymmetric anisotropic metamaterial

Sayem, Ayed Al; Mahdy, M. R. C.; Rahman, Saifur

doi:10.1088/2040-8978/18/1/015101

Cited by 27 publications

(20 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The period-icity of the multilayer is Λ = 100 nm and 5 periods have been deposited on the prism. The Maxwell-Garnett effective medium theory (EMT) [57] predicts that the multilayer with subwavelength periodicity demonstrates strong anisotropy [37,[58][59][60][61] at the operating wavelength (ε 2y = ε 2z = ε Si ρ + ε SiO2 (1 − ρ) and 1/ε 2x = ρ/ε Si +(1−ρ)/ε SiO2 where ρ is the fill fraction of silicon). Note we are in the effective medium metamaterial limit (Λ λ) away from the photonic crystal regime (Λ ∼ λ).…”

Section: Resultsmentioning

confidence: 99%

Controlling evanescent waves using silicon photonic all-dielectric metamaterials for dense integration

et al. 2018

View full text Add to dashboard Cite

Ultra-compact, densely integrated optical components manufactured on a CMOS-foundry platform are highly desirable for optical information processing and electronic-photonic co-integration. However, the large spatial extent of evanescent waves arising from nanoscale confinement, ubiquitous in silicon photonic devices, causes significant cross-talk and scattering loss. Here, we demonstrate that anisotropic all-dielectric metamaterials open a new degree of freedom in total internal reflection to shorten the decay length of evanescent waves. We experimentally show the reduction of cross-talk by greater than 30 times and the bending loss by greater than 3 times in densely integrated, ultra-compact photonic circuit blocks. Our prototype all-dielectric metamaterial-waveguide achieves a low propagation loss of approximately 3.7±1.0 dB/cm, comparable to those of silicon strip waveguides. Our approach marks a departure from interference-based confinement as in photonic crystals or slot waveguides, which utilize nanoscale field enhancement. Its ability to suppress evanescent waves without substantially increasing the propagation loss shall pave the way for all-dielectric metamaterial-based dense integration.

show abstract

Section: Resultsmentioning

confidence: 99%

Controlling evanescent waves using silicon photonic all-dielectric metamaterials for dense integration

et al. 2018

View full text Add to dashboard Cite

show abstract

“…The second aspect is based on the negative refraction behaviour across the interface of HMM/free space 6 , 36 , 37 . For paraxial incidence (verified by Gaussian beam), the excited high k -modes preferentially propagates inside HMM with an angle of refraction, with respect to the optical axis, defined by the ratio of components of Poynting vectors, according to the following relation 38 : when , the limit of the angle is approximated as follows: …”

Section: Theoretical Designmentioning

confidence: 99%

Free space super focusing using all dielectric hyperbolic metamaterial

Salama¹,

Desouky²,

Obayya³

et al. 2020

Sci Rep

View full text Add to dashboard Cite

Despite that Hyperbolic Metamaterial (HMM) has demonstrated sub-wavelength focusing inside of it, sub-wavelength imaging in free space of HMM is rarely introduced. The decay of hyperbolic momentum space outside the hyperbolic medium has hindered the realization of sub-wavelengh focusing in the near field of HMM. Furthermore, manipulating the negatively refracted waves exiting the HMM have addressed another major obstacle to realize free space sub-wavelength focusing. In this work, we report extended sub-wavelength focusing in free space based on negative refraction of light exiting the HMM. The proposed structure is composed of multilayers of doped InAs/intrinsic InAs integrated with metallic slit. We theoretically simulate the doped InAs/intrinsic InAs HMM and investigate the negative refraction behavior outside the HMM. We optimized the structure for achieving high resolution down to 0.2λ, extended to a distance of 3.2 µm in free space. Also, sub-wavelength focusing in free space has been studied at different doping concentrations showing that the small doping concentrations exhibit enhancement in resolution at short distances up to 600 nm away from the HMM. Extending the focusing distance is achieved up to distance 3.5 µm from the hyperbolic structure by manipulating the doping concentration. This proposed lens configuration is expected to find potential usage in mid IR thermal imaging and photolithography application.

show abstract

“…Motivated by the methods and structures of researches to achieve broad angle [26,27], and high absorption [28,29], and driven by the essential need for polarization-independent ultra-wideband meta-absorber, we theoretically investigate a bilayer graphene-based absorption structure with Au cylinder arrays on parylene substrate. We use the cascading bilayer graphene structure with two different frequency resonances.…”

Section: Introductionmentioning

confidence: 99%

Polarization-Independent Tunable Ultra-Wideband Meta-Absorber in Terahertz Regime

Liu

Deng

et al. 2019

Electronics

View full text Add to dashboard Cite

In this paper, we demonstrate an ultra-broadband terahertz bilayer graphene-based absorption structure. It has two stacking graphene layers sandwiched by an Au cylinders array, backed by a metallic ground plane. Au cylinders are used to adjust the input impedance to be closely matched to the free space, enabling an ultra-broadband absorption. The absorption spectrum of the bilayer graphene-based absorption structure with Au cylinder arrays shows a bandwidth of 7.1 THz, with the absorption exceeding 80%. The achieved ultra-wideband THz meta-absorber has high absorption, independence of polarization property, simultaneously, illustrating to be a promising candidate for teraherz broadband absorption application.

show abstract

Broad angle negative refraction in lossless all dielectric or semiconductor based asymmetric anisotropic metamaterial

Cited by 27 publications

References 42 publications

Controlling evanescent waves using silicon photonic all-dielectric metamaterials for dense integration

Controlling evanescent waves using silicon photonic all-dielectric metamaterials for dense integration

Free space super focusing using all dielectric hyperbolic metamaterial

Polarization-Independent Tunable Ultra-Wideband Meta-Absorber in Terahertz Regime

Contact Info

Product

Resources

About