A Subwavelength Plasmonic Waveguide Filter with a Ring Resonator

The transmission characteristics of the electromagnetic wave are numerically investigated in two-dimensional compound plasmonic structures composed of two straight subwavelength metal-insulator-metal (MIM) waveguides and a ring resonator. The two straight MIM waveguides situate on both sides of the ring resonator, and the MIM waveguide of the outgoing side has a positional angular deviationθrelative to the MIM waveguide of the incoming side. The results show that the filtering performances of the asymmetric structures(θ≠0∘)are greatly improved in comparison with the symmetric structure(θ=0∘). For most of the asymmetric structures, there is a transmission minimum at the slightly bigger wavelength than one at which the transmission peak appears for the symmetric structures, and there is still a transmission peak at the wavelength of the transmission peak of the symmetric structures. Moreover, the difference between the transmission peak and valley is increased, and the breadth of the transmission peak becomes narrow.

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Enhancing the sensitivity of a standard plasmonic MIM square ring resonator by incorporating the Nano-dots in the cavity

Photonics Letters of Poland ◽

10.4302/plp.v12i1.902 ◽

2020 ◽

Vol 12 (1) ◽

pp. 1 ◽

Cited By ~ 3

Author(s):

Muhammad Ali ALI Butt ◽

Nikolay Kazanskiy

Keyword(s):

Refractive Index ◽

Fano Resonance ◽

Ring Resonator ◽

Plasmonic Waveguide ◽

Metal Insulator ◽

Refractive Index Sensing ◽

Sensing Applications ◽

Resonator Design ◽

Metal Insulator Metal ◽

Mim Waveguide

We studied the metal-insulator-metal square ring resonator design incorporated with nano-dots that serve to squeeze the surface plasmon wave in the cavity of the ring. The E-field enhances at the boundaries of the nano-dots providing a strong interaction of light with the surrounding medium. As a result, the sensitivity of the resonator is highly enhanced compared to the standard ring resonator design. The best sensitivity of 907 nm/RIU is obtained by placing seven nano-dots of radius 4 nm in all four sides of the ring with a period (ᴧ)= 3r. The proposed design will find applications in biomedical science as highly refractive index sensors. Full Text: PDF References:Z. Han, S. I. Bozhevolnyi. "Radiation guiding with surface plasmon polaritons", Rep. Prog. Phys. 76, 016402 (2013). [CrossRef]N.L. Kazanskiy, S.N. Khonina, M.A. Butt. "Plasmonic sensors based on Metal-insulator-metal waveguides for refractive index sensing applications: A brief review", Physica E 117, 113798 (2020). [CrossRef]D.K. Gramotnev, S.I. Bozhevolnyi. "Plasmonics beyond the diffraction limit", Nat. Photonics 4, 83 (2010). [CrossRef]A.N.Taheri, H. Kaatuzian. "Design and simulation of a nanoscale electro-plasmonic 1 × 2 switch based on asymmetric metal–insulator–metal stub filters", Applied Optics 53, 28 (2014). [CrossRef]P. Neutens, L. Lagae, G. Borghs, P. V. Dorpe. "Plasmon filters and resonators in metal-insulator-metal waveguides", Optics Express 20, 4 (2012). [CrossRef]M.A. Butt, S.N. Khonina, N. L. Kazanskiy. "Metal-insulator-metal nano square ring resonator for gas sensing applications", Waves in Random and complex media [CrossRef]M.A.Butt, S.N.Khonina, N.L.Kazanskiy. "Hybrid plasmonic waveguide-assisted Metal–Insulator–Metal ring resonator for refractive index sensing", Journal of Modern Optics 65, 1135 (2018). [CrossRef]M.A.Butt, S.N. Khonina, N.L. Kazanskiy, "Highly sensitive refractive index sensor based on hybrid plasmonic waveguide microring resonator", Waves in Random and complex media [CrossRef]Y. Fang, M. Sun. "Nanoplasmonic waveguides: towards applications in integrated nanophotonic circuits", Light:Science & Applications 4, e294 (2015). [CrossRef]H. Lu, G.X. Wang, X.M. Liu. "Manipulation of light in MIM plasmonic waveguide systems", Chin Sci Bull [CrossRef]J.N. Anker et al. "Biosensing with plasmonic nanosensors", Nature Materials 7, 442 (2008). [CrossRef]M.A.Butt, S.N. Khonina, N.L. Kazanskiy. Journal of Modern Optics 66, 1038 (2019).[CrossRef]Z.-D. Zhang, H.-Y. Wang, Z.-Y. Zhang. "Fano Resonance in a Gear-Shaped Nanocavity of the Metal–Insulator–Metal Waveguide", Plasmonics 8,797 (2013) [CrossRef]Y. Yu, J. Si, Y. Ning, M. Sun, X. Deng. Opt. Lett. 42, 187 (2017) [CrossRef]B.H.Zhang, L-L. Wang, H-J. Li et al. "Two kinds of double Fano resonances induced by an asymmetric MIM waveguide structure", J. Opt. 18,065001 (2016) [CrossRef]X. Zhao, Z. Zhang, S. Yan. "Tunable Fano Resonance in Asymmetric MIM Waveguide Structure", Sensors 17, 1494 (2017) [CrossRef]J. Zhou et al. "Transmission and refractive index sensing based on Fano resonance in MIM waveguide-coupled trapezoid cavity", AIP Advances 7, 015020 (2017) [CrossRef]V. Perumal, U. Hashim. "Advances in biosensors: Principle, architecture and applications", J. Appl. Biomed. 12, 1 (2014)[CrossRef]H.Gai, J. Wang , Q. Tian, "Modified Debye model parameters of metals applicable for broadband calculations", Appl. Opt. 46 (12), 2229 (2007) [CrossRef]

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Excitation Schemes of Plasmonic Angular Ring Resonator-Based Band-Pass Filters Using a MIM Waveguide

Photonics ◽

10.3390/photonics6020041 ◽

2019 ◽

Vol 6 (2) ◽

pp. 41 ◽

Cited By ~ 1

Author(s):

Vishwanath Mittapalli ◽

Habibulla Khan

Keyword(s):

Ring Resonator ◽

Simulation Software ◽

Ring Resonators ◽

Band Pass Filter ◽

Pass Filter ◽

Analysis And Design ◽

Compact Size ◽

Metal Insulator Metal ◽

Band Pass ◽

Mim Waveguide

This article describes the analysis and design of the excitation schemes of the plasmonic angular ring resonator-based band-pass filters using a metal-insulator-metal (MIM) waveguide. The excitation schemes of the plasmonic angular ring resonator-based band-pass filters have been analyzed in terms of their physical length by using commercially available electromagnetic full-wave simulation software (CST microwave studio). The excitation schemes of the plasmonic angular ring resonator-based band-pass filter using a MIM waveguide have been realized at the optical O (1260–1360 nm) and U (1625–1675 nm) bands, respectively, as it has dual-band characteristics. The excitation schemes of the plasmonic angular ring resonators have been designed and simulated to determine the variation in transmission and reflection coefficients. The magnetic field distribution of the proposed filters was observed. The ring resonators require low power and had a compact size, which was further used for the development of photonic integrated circuits (PICs). The applications of these resonators are further extended and they are used in the development of antennas, branch line couplers, directional couplers and diplexers.

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Study on the Nanosensor Based on a MIM Waveguide with a Stub Coupled with a Horizontal B-Type Cavity

Photonics ◽

10.3390/photonics8040125 ◽

2021 ◽

Vol 8 (4) ◽

pp. 125

Author(s):

Shubin Yan ◽

Haoran Shi ◽

Xiaoyu Yang ◽

Jing Guo ◽

Wenchang Wu ◽

...

Keyword(s):

Refractive Index ◽

Spectral Characteristics ◽

High Sensitivity ◽

Refractive Index Sensor ◽

Plasmonic Sensors ◽

Sensing Applications ◽

Compact Size ◽

Metal Insulator Metal ◽

The Difference ◽

Mim Waveguide

Due to their compact size and high sensitivity, plasmonic sensors have become a hot topic in the sensing field. A nanosensor structure, comprising the metal–insulator–metal (MIM) waveguide with a stub and a horizontal B-Type cavity, is designed as a refractive index sensor. The spectral characteristics of proposed structure are analyzed via the finite element method (FEM). The results show that there is a sharp Fano resonance profile, which is excited by a coupling between the MIM waveguide and the horizontal B-Type cavity. The normalized HZ field is affected by the difference value between the outer radii R1 and R2 of the semi-circle of the horizontal B-Type cavity greatly. The influence of every element of the whole system on sensing properties is discussed in depth. The sensitivity of the proposed structure can obtain 1548 nm/RIU (refractive index unit) with a figure of merit of 59. The proposed structure has potential in nanophotonic sensing applications.

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Formation Laws of Direction of Fano Line-Shape in a Ring MIM Plasmonic Waveguide Side-Coupled with a Rectangular Resonator and Nano-Sensing Analysis of Multiple Fano Resonances

Crystals ◽

10.3390/cryst11070819 ◽

2021 ◽

Vol 11 (7) ◽

pp. 819

Author(s):

Dayong Zhang ◽

Li Cheng ◽

Zuochun Shen

Keyword(s):

Finite Element Method ◽

Refractive Index ◽

Line Shape ◽

Fano Resonance ◽

Ring Resonator ◽

Fano Resonances ◽

Metal Insulator ◽

Refractive Index Sensing ◽

Metal Insulator Metal ◽

Mim Waveguide

Plasmonic MIM (metal-insulator-metal) waveguides based on Fano resonance have been widely researched. However, the regulation of the direction of the line shape of Fano resonance is rarely mentioned. In order to study the regulation of the direction of the Fano line-shape, a Fano resonant plasmonic system, which consists of a MIM waveguide coupled with a ring resonator and a rectangle resonator, is proposed and investigated numerically via FEM (finite element method). We find the influencing factors and formation laws of the ‘direction’ of the Fano line-shape, and the optimal condition for the generation of multiple Fano resonances; and the application in refractive index sensing is also well studied. The conclusions can provide a clear theoretical reference for the regulation of the direction of the line shape of Fano resonance and the generation of multi Fano resonances in the designs of plasmonic nanodevices.

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Tunable triple Fano resonance in MIM waveguide system with split ring resonator

Optical and Quantum Electronics ◽

10.1007/s11082-021-02994-w ◽

2021 ◽

Vol 53 (8) ◽

Author(s):

Xuebo Liu ◽

Qian Yang ◽

Kexue Peng ◽

Baohua Zhang ◽

Haineng Bai ◽

...

Keyword(s):

Fano Resonance ◽

Ring Resonator ◽

Split Ring Resonator ◽

Split Ring ◽

Waveguide System ◽

Mim Waveguide

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Odd Willis coupling induced by broken time-reversal symmetry

Nature Communications ◽

10.1038/s41467-021-22745-5 ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Li Quan ◽

Simon Yves ◽

Yugui Peng ◽

Hussein Esfahlani ◽

Andrea Alù

Keyword(s):

Time Reversal ◽

Time Reversal Symmetry ◽

Acoustic Metamaterials ◽

Asymmetric Structures ◽

Sound Control ◽

Wavefront Shaping ◽

Scattering Response ◽

Symmetric Structures ◽

Signal Routing ◽

Broad Interest

AbstractWhen sound interacts with geometrically asymmetric structures, it experiences coupling between pressure and particle velocity, known as Willis coupling. While in most instances this phenomenon is perturbative in nature, tailored asymmetries combined with resonances can largely enhance it, enabling exotic acoustic phenomena. In these systems, Willis coupling obeys reciprocity, imposing an even symmetry of the Willis coefficients with respect to time reversal and the impinging wave vector, which translates into stringent constraints on the overall scattering response. In this work, we introduce and experimentally observe a dual form of acoustic Willis coupling, arising in geometrically symmetric structures when time-reversal symmetry is broken, for which the pressure-velocity coupling is purely odd-symmetric. We derive the conditions to maximize this effect, we experimentally verify it in a symmetric subwavelength scatterer biased by angular momentum, and we demonstrate the opportunities for sound scattering enabled by odd Willis coupling. Our study opens directions for acoustic metamaterials, with direct implications for sound control, non-reciprocal scattering, wavefront shaping and signal routing, of broad interest also for nano-optics, photonics, elasto-dynamics, and mechanics.

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Design of a Liquid-Crystal-Tunable Terahertz Demultiplexer Based on a Metal-Insulator-Metal Waveguide

Applied Sciences ◽

10.3390/app9040644 ◽

2019 ◽

Vol 9 (4) ◽

pp. 644

Author(s):

Xue-Shi Li ◽

Naixing Feng ◽

Yuan-Mei Xu ◽

Liang-Lun Cheng ◽

Qing Liu

Keyword(s):

Liquid Crystal ◽

Electric Field ◽

Metal Insulator ◽

Resonance Modes ◽

External Bias ◽

Bias Electric Field ◽

Metal Waveguide ◽

Metal Insulator Metal ◽

Fabry Perot ◽

Mim Waveguide

A tunable demultiplexer with three output channels infiltrated by liquid crystal (LC) is presented, which is based on a metal-insulator-metal (MIM) waveguide. The operating frequencies of the three output channels can be tuned simultaneously at will by changing the external bias electric field applied to the LC. By analyzing the Fabry-Pérot (FP) resonance modes of the finite-length MIM waveguide both theoretically and numerically, the locations of the three channels are delicately determined to achieve the best demultiplexing effects. Terahertz (THz) signals input from the main channel can be demultiplexed by channels 1, 2 and 3 at 0.7135 THz, 1.068 THz and 1.429 THz, respectively. By applying an external electric field to alter the tilt angle of the infiltrating LC material, the operating frequencies of channels 1, 2 and 3 can be relatively shifted up to 12.3%, 9.6% and 9.7%, respectively. The designed demultiplexer can not only provide a flexible means to demultiplex signals but also tune operating bands of output channels at the same time.

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The energy separation effect based on the disk resonance multichannel MIM waveguide

Modern Physics Letters B ◽

10.1142/s0217984916503449 ◽

2016 ◽

Vol 30 (28) ◽

pp. 1650344

Author(s):

Liu Wang ◽

Ya-Ping Zeng ◽

Zhi-Yong Wang ◽

Xiong-Ping Xia ◽

Qiu-Qun Liang

Keyword(s):

Near Infrared ◽

Fdtd Method ◽

Output Port ◽

Infrared Light ◽

Energy Separation ◽

Band Pass Filter ◽

Separation Function ◽

Pass Filter ◽

Metal Insulator Metal ◽

Mim Waveguide

In this paper, a multichannel metal–insulator–metal (MIM) waveguide structure based on a disk resonator is proposed. The transmission characteristics of visible and near-infrared light in the waveguide are investigated by using the finite-difference time-domain (FDTD) method. The results show that the structure has typical band-pass filter function due to the wave resonance in the nanodisk. The energy of the second-order resonance wavelength of the disk can transmit through each output port averagely, which is realized by the energy separation function of the electromagnetic wave. Moreover, the wavelength will transmit through the output port in redshift as the radius and/or the refractive index of the disk are increased. The transmissivity is sharply reduced with the increase of the coupling thickness between the disk and the output port waveguide.

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WAVELENGTH DEMULTIPLEXING IN METAL–INSULATOR–METAL PLASMONIC WAVEGUIDES

Modern Physics Letters B ◽

10.1142/s0217984914500250 ◽

2014 ◽

Vol 28 (04) ◽

pp. 1450025 ◽

Cited By ~ 3

Author(s):

XIANKUN YAO

Keyword(s):

Transmission Efficiency ◽

Plasmonic Waveguides ◽

Metal Insulator ◽

Metal Insulator Metal ◽

Integrated Optical ◽

Potential Applications ◽

Wavelength Demultiplexing ◽

Optical Circuits ◽

Difference Time ◽

Mim Waveguide

In this paper, we have numerically investigated a novel kind of ultra-compact wavelength demultiplexing (WDM) in high-confined metal–insulator–metal (MIM) plasmonic waveguides. It is found that the drop transmission efficiency of the filtering cavity can be strongly enhanced by introducing a side-coupled cavity in the MIM waveguide. The theoretical analysis is verified by the finite-difference time-domain simulations. Through cascading the filtering units, a highly effective triple-wavelength demultiplexer is proposed by selecting the specific separation between the two coupled cavities of filtering units. Our results may find potential applications for the nanoscale WDM systems in highly integrated optical circuits and networks.

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A Nanoscale Structure Based on an MIM Waveguide Coupled with a Q Resonator for Monitoring Trace Element Concentration in the Human Body

Micromachines ◽

10.3390/mi12111384 ◽

2021 ◽

Vol 12 (11) ◽

pp. 1384

Author(s):

Tingsong Li ◽

Shubin Yan ◽

Pengwei Liu ◽

Xiaoyu Zhang ◽

Yi Zhang ◽

...

Keyword(s):

Human Body ◽

Figure Of Merit ◽

Refractive Index Sensor ◽

The Finite Element Method ◽

Transmission Characteristics ◽

Metal Insulator Metal ◽

Potential Applications ◽

Internal Mechanism ◽

Nanoscale Structure ◽

Mim Waveguide

In this study, a nano-refractive index sensor is designed that consists of a metal–insulator–metal (MIM) waveguide with a stub-1 and an orthogon ring resonator (ORR) with a stub-2. The finite element method (FEM) was used to analyze the transmission characteristics of the system. We studied the cause and internal mechanism of Fano resonance, and optimized the transmission characteristics by changing various parameters of the structure. In our experimental data, the suitable sensitivity could reach 2260 nm/RIU with a figure of merit of 211.42. Furthermore, we studied the detection of the concentration of trace elements (such as Na+) of the structure in the human body, and its sensitivity reached 0.505 nm/mgdL−1. The structure may have other potential applications in sensors.

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