scholarly journals Extraordinary Optical Transmission by Hybrid Phonon–Plasmon Polaritons Using hBN Embedded in Plasmonic Nanoslits

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1567
Author(s):  
Shinpei Ogawa ◽  
Shoichiro Fukushima ◽  
Masaaki Shimatani
Keyword(s):  
Optical Transmission ◽  
Hexagonal Boron Nitride ◽  
Incident Angle ◽  
Optical Filters ◽  
Extraordinary Optical Transmission ◽  
Light Manipulation ◽  
Rigorous Coupled Wave Analysis ◽  
Fabry Perot ◽  
Hyperbolic Dispersion ◽  
Rigorous Coupled Wave

Hexagonal boron nitride (hBN) exhibits natural hyperbolic dispersion in the infrared (IR) wavelength spectrum. In particular, the hybridization of its hyperbolic phonon polaritons (HPPs) and surface plasmon resonances (SPRs) induced by metallic nanostructures is expected to serve as a new platform for novel light manipulation. In this study, the transmission properties of embedded hBN in metallic one-dimensional (1D) nanoslits were theoretically investigated using a rigorous coupled wave analysis method. Extraordinary optical transmission (EOT) was observed in the type-II Reststrahlen band, which was attributed to the hybridization of HPPs in hBN and SPRs in 1D nanoslits. The calculated electric field distributions indicated that the unique Fabry–Pérot-like resonance was induced by the hybridization of HPPs and SPRs in an embedded hBN cavity. The trajectory of the confined light was a zigzag owing to the hyperbolicity of hBN, and its resonance number depended primarily on the aspect ratio of the 1D nanoslit. Such an EOT is also independent of the slit width and incident angle of light. These findings can not only assist in the development of improved strategies for the extreme confinement of IR light but may also be applied to ultrathin optical filters, advanced photodetectors, and optical devices.

Optical Properties of Thin Crystalline Silicon Nanostructures for Photovoltaic Applications

2013 ◽  
Author(s):  
Xing Fang ◽  
Changying Zhao ◽  
Hua Bao
Keyword(s):  
Lattice Constant ◽  
Crystalline Silicon ◽  
Incident Angle ◽  
Nanowire Arrays ◽  
Raw Material ◽  
Silicon Nanostructures ◽  
Rigorous Coupled Wave Analysis ◽  
Nanohole Arrays ◽  
Rigorous Coupled Wave ◽  
Ultimate Efficiency

The optical performance of four lattice crystalline silicon nanostructures, i.e., cylinder nanowire arrays, cylinder nanohole arrays, square nanowire arrays and square nanohole arrays is numerically investigated in this paper. The method of rigorous coupled-wave analysis (RCWA), an efficient and accurate computational tool, is used to calculate the optical absorption for the lattice constant from 100 nm to 1500 nm. The results indicate that the lattice constant is the foremost structure parameter to determine the ultimate efficiency, and the ultimate efficiencies are reached at the lattice constant around 600 nm. The optimal filling ratio of square nanowire arrays is the lowest among the four nonostructures, whereas the cylinder nanohole arrays exhibit a broad range of optimal filling ratios. Lower optimal filling ratios implies that the nanostructures cost less raw material while maintain the high ultimate efficiencies. The high ultimate efficiency of all structures can be achieved over a large range of incident angles, even the efficiency will slowly decrease as the incident angle increases.

Spectral Features of an Omnidirectional Narrowband Emitter

2012 ◽  
Vol 134 (10) ◽  
Author(s):  
Yutao Zhang ◽  
Yimin Xuan
Keyword(s):  
Incident Angle ◽  
Structural Parameters ◽  
Infrared Region ◽  
Transverse Magnetic ◽  
Silver Layer ◽  
Spectral Features ◽  
Structured Surface ◽  
Rigorous Coupled Wave Analysis ◽  
Spectral Emittance ◽  
Rigorous Coupled Wave

A microscale-structured surface consisting of heavily doped silicon rectangle grating and slotted silver layer is studied for omnidirectional narrowband emitter. Numerical simulation is implemented to obtain spectral emittance in mid-infrared region (6–16 μm) for the transverse magnetic incidence by using the rigorous coupled-wave analysis (RCWA) method. The effects of structural parameters and incident angle on its spectral emittance are investigated. In virtue of the microcavity effect, an omnidirectional narrowband emitter is proposed. By selecting a group of structural parameters, its peak emittance reaches as high as 0.998, and the peak width Δλ/λ of the emittance peak is as narrow as 0.03 at the specified wavelength. The results reveal that our proposed structured surface has the nice spectral features of angular uniformity and wavelength-selective characteristic, which can be applied to design novel narrowband thermal emitters and detectors in the infrared region.

scholarly journals Effects of Measurement Configurations on the Sensitivity of Morpho Butterfly Scales Based Chemical Biosensor

2022 ◽  
Vol 9 ◽  
Author(s):  
Zhengqiong Dong ◽  
Hang Zhao ◽  
Lei Nie ◽  
Shaokang Tang ◽  
Chenyang Li ◽  
...  
Keyword(s):  
Ambient Medium ◽  
Incident Angle ◽  
Azimuthal Angle ◽  
Detection Sensitivity ◽  
Butterfly Wing ◽  
Rigorous Coupled Wave Analysis ◽  
Rigorous Coupled Wave ◽  
Rectangular Groove ◽  
Morpho Butterfly ◽  
Selection Of

The Morpho butterfly wing with tree-shaped alternating multilayer is an effective chemical biosensor to distinguish between ambient medium, and its detection sensitivity is inextricably linked to the measurement configuration including incident angle, azimuthal angle, and so on. In order to reveal the effects and the selection of measurement configuration. In this work, the model of the Morpho butterfly wing is built using the rigorous coupled-wave analysis method by considering its profile is a rectangular-groove grating. On basis of the above model, the reflectivity of different diffraction orders at a different incident angle and azimuthal angle is calculated, and the influence of incident angle and azimuthal angle on performance of Morpho butterfly scales-based biosensor is analyzed. The optimal incident angle at each azimuthal angle is given according to the proposed choice rule, then the azimuthal angle and the corresponding incident angle can be selected further.

scholarly journals Magnetically Tunable Liquid Crystal-Based Optical Diffraction Gratings

Polymers ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2355 ◽  
Author(s):  
Dejan Bošnjaković ◽  
Nerea Sebastián ◽  
Irena Drevenšek-Olenik
Keyword(s):  
Magnetic Field ◽  
Liquid Crystal ◽  
Optical Transmission ◽  
Optical Element ◽  
Optical Diffraction ◽  
Rigorous Coupled Wave Analysis ◽  
Diffraction Structure ◽  
Rigorous Coupled Wave ◽  
The One ◽  
Orientational Structure

We present a theoretical analysis of optical diffractive properties of magnetically tunable optical transmission gratings composed of periodically assembled layers of a polymer and a ferromagnetic liquid crystal (LC). The orientational structure of the LC layers as a function of an applied magnetic field is calculated by minimization of the Landau-de Gennes free energy for ferromagnetic LCs, which is performed numerically and also analytically by using the one-constant approximation and the approximations of the high and the low magnetic fields. Optical diffractive properties of the associated diffraction structure are calculated numerically in the framework of rigorous coupled-wave analysis (RCWA). The presented methodology provides a basis for designing new types of diffractive optical element based on ferromagnetic LCs and simulating their operation governed by the in-plane magnetic field.

Influence of Asymmetry on Extraordinary Optical Transmission through Periodic Arrays of Triangular Holes

2011 ◽  
Vol 418-420 ◽  
pp. 121-124
Author(s):  
Wen Jing Yin ◽  
Li Yu ◽  
Kai Zhang
Keyword(s):  
Electric Field ◽  
Optical Transmission ◽  
Fdtd Method ◽  
High Sensitivity ◽  
Extraordinary Optical Transmission ◽  
Periodic Arrays ◽  
Incident Electric Field ◽  
Fabry Perot ◽  
Plasmon Polaritons ◽  
Channel Plasmon Polaritons

The effect of asymmetry on extraordinary optical transmission (EOT) through arrays of triangular holes with acute angles was investigated using FDTD method. It was found that the transmissions are strongly dependent on the different linear polarizations of the incident electric field, and could be tuned by varying the asymmetry of arrays of triangular holes. It could be demonstrated that these properties were associated with the existence of channel plasmon-polaritons (CPPs), which make it possible to realize Fabry-Perot (FP) resonances inside the triangular holes. The results may be very useful for EOT applications which require high sensitivity on the polarization of the incident electric field and the shape of holes in the arrays.

Stack-based grating for wideband polarization splitter in terahertz

2021 ◽  
Author(s):  
Zefan Lin ◽  
Bo Wang ◽  
Chen Fu
Keyword(s):  
Communication Systems ◽  
Simulated Annealing Algorithm ◽  
High Efficiency ◽  
Incident Angle ◽  
Reference Value ◽  
Transverse Magnetic ◽  
Large Bandwidth ◽  
Rigorous Coupled Wave Analysis ◽  
Terahertz Band ◽  
Rigorous Coupled Wave

Abstract A novel wideband terahertz polarization beam splitter with special diffraction orders working at terahertz band is described in this paper. The polarizer can achieve high diffraction efficiency and uniformity in the 2.50 - 2.56 THz band. Based on rigorous coupled-wave analysis (RCWA) and simulated annealing algorithm, we proposed an efficient algorithm to optimize the polarizer. After calculations, 98.45% single-port high-efficiency reflection for transverse electric (TE) polarization and 42.33%/42.57% highly uniform dual-port beam splitting for transverse magnetic (TM) polarization were finally obtained. In addition, through RCWA and simplified modal method, the electromagnetic field distributions of TE and TM polarizations are shown visually and described quantitatively. Moreover, the results displayed in Sec. 3 prove that the grating possesses the characteristics of relatively large bandwidth and insensitivity to the incident angle. Therefore, the novel scheme in this paper has great reference value for the research of terahertz modulation devices and the integration of terahertz communication systems.

scholarly journals Tunable dual-band perfect absorbers based on extraordinary optical transmission and Fabry-Perot cavity resonance

2012 ◽  
Vol 20 (21) ◽  
pp. 24002 ◽  
Author(s):  
H. Y. Zheng ◽  
X. R. Jin ◽  
J. W. Park ◽  
Y. H. Lu ◽  
Joo Yull Rhee ◽  
...  
Keyword(s):  
Optical Transmission ◽  
Extraordinary Optical Transmission ◽  
Dual Band ◽  
Cavity Resonance ◽  
Fabry Perot ◽  
Perfect Absorbers

scholarly journals Observation of giant Goos-Hänchen and angular shifts at designed metasurfaces

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Venkata Jayasurya Yallapragada ◽  
Ajith P. Ravishankar ◽  
Gajendra L. Mulay ◽  
Girish S. Agarwal ◽  
Venu Gopal Achanta
Keyword(s):  
Phase Changes ◽  
Periodic Patterns ◽  
Incident Wavelength ◽  
Force Microscopy ◽  
Light Manipulation ◽  
Rigorous Coupled Wave Analysis ◽  
Complete Vector ◽  
Rigorous Coupled Wave ◽  
Phase Amplitude ◽  
And Control

Abstract Metasurfaces with sub-wavelength features are useful in modulating the phase, amplitude or polarization of electromagnetic fields. While several applications are reported for light manipulation and control, the sharp phase changes would be useful in enhancing the beam shifts at reflection from a metasurface. In designed periodic patterns on metal film, at surface plasmon resonance, we demonstrate Goos-Hanchen shift of the order of 70 times the incident wavelength and the angular shifts of several hundred microradians. We have designed the patterns using rigorous coupled wave analysis (RCWA) together with S-matrices and have used a complete vector theory to calculate the shifts as well as demonstrate a versatile experimental setup to directly measure the shifts. The giant shifts demonstrated could prove to be useful in enhancing the sensitivity of experiments ranging from atomic force microscopy to gravitational wave detection.

scholarly journals Graphene-based tunable hyperbolic microcavity

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Michał Dudek ◽  
Rafał Kowerdziej ◽  
Alessandro Pianelli ◽  
Janusz Parka
Keyword(s):  
Resonant Mode ◽  
Transverse Magnetic ◽  
Mid Infrared ◽  
Nanophotonic Devices ◽  
Wide Range ◽  
Fabry Perot ◽  
Hyperbolic Dispersion ◽  
Low Threshold ◽  
Infrared Frequencies ◽  
Infrared Wave

AbstractGraphene-based hyperbolic metamaterials provide a unique scaffold for designing nanophotonic devices with active functionalities. In this work, we have theoretically demonstrated that the characteristics of a polarization-dependent tunable hyperbolic microcavity in the mid-infrared frequencies could be realized by modulating the thickness of the dielectric layers, and thus breaking periodicity in a graphene-based hyperbolic metamaterial stack. Transmission of the tunable microcavity shows a Fabry–Perot resonant mode with a Q-factor > 20, and a sixfold local enhancement of electric field intensity. It was found that by varying the gating voltage of graphene from 2 to 8 V, the device could be self-regulated with respect to both the intensity (up to 30%) and spectrum (up to 2.1 µm). In addition, the switching of the device was considered over a wide range of incident angles for both the transverse electric and transverse magnetic modes. Finally, numerical analysis indicated that a topological transition between elliptic and type II hyperbolic dispersion could be actively switched. The proposed scheme represents a remarkably versatile platform for the mid-infrared wave manipulation and may find applications in many multi-functional architectures, including ultra-sensitive filters, low-threshold lasers, and photonic chips.

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