Plasmonic perfect absorber based on metal nanorod arrays connected with veins

Chau, Yuan-Fong Chou; Chao, Chung-Ting Chou; Huang, Hung Ji; Usman, Anwar; Lim, Chee Ming; Voo, Nyuk Yoong; Mahadi, Abdul Hanif; Thotagamuge, Roshan; Chiang, Hai‐Pang

doi:10.1016/j.rinp.2019.102567

Cited by 56 publications

(32 citation statements)

References 70 publications

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“…The different radius of silver nanorod ( r 1 ) in the wider rectangular cavity will change the resonance condition of free space in the proposed structure, and they have a remarkable influence on the transmittance spectrum. Silver nanorod defects that are positioned at Bragg distance between the silver walls and silver nanorods are composed of a Fabry–Pérot nanocavity [52,53], and they construct a coupled photonic–plasmonic system [54]. In order to study the influence of r 1 in the proposed plasmonic MIM waveguide, the transmittance spectra for different radii of the silver nanorods with r 1 = (0, 8, 10, 12, 14, 16, 18, 20, 22, 23, 24, 25) nm, respectively, were examined (see Figure 6), while r 2 is kept with 10 nm in the narrower rectangular cavity and other parameters are set as the same as used in Figure 2.…”

Section: Resultsmentioning

confidence: 99%

Ultra-High Refractive Index Sensing Structure Based on a Metal-Insulator-Metal Waveguide-Coupled T-Shape Cavity with Metal Nanorod Defects

et al. 2019

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An ultra-high plasmonic refractive index sensing structure composed of a metal–insulator–metal (MIM) waveguide coupled to a T-shape cavity and several metal nanorod defects is proposed and investigated by using finite element method. The designed plasmonic MIM waveguide can constitute a cavity resonance zone and the metal nanorod defects can effectively trap the light in the T-shape cavity. The results reveal that both the size of defects in wider rectangular cavity and the length of narrower rectangular cavity are primary factors increasing the sensitivity performance. The sensitivity can achieve as high as 8280 nm/RIU (RIU denotes the refractive index unit), which is the highest sensitivity reported in plasmonic MIM waveguide-based sensors to our knowledge. In addition, the proposed structure can also serve as a temperature sensor with temperature sensitivity as high as 3.30 nm/°C. The designed structure with simplicity and ease of fabrication can be applied in sensitivity nanometer scale refractive index sensor and may potentially be used in optical on-chip nanosensor.

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Section: Resultsmentioning

confidence: 99%

Ultra-High Refractive Index Sensing Structure Based on a Metal-Insulator-Metal Waveguide-Coupled T-Shape Cavity with Metal Nanorod Defects

et al. 2019

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“…In particular, plasmonic MIM waveguide sensors are necessary for an atmospheric transparent window of the MIR spectrum from 2 to 12 µm. Therefore, there are still many efforts in this field that need to be made [27][28][29].…”

Section: Introductionmentioning

confidence: 99%

A Nanosensor Based on a Metal-Insulator-Metal Bus Waveguide with a Stub Coupled with a Racetrack Ring Resonator

et al. 2021

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A nanostructure comprising the metal-insulator-metal (MIM) bus waveguide with a stub coupled with a racetrack ring resonator is designed. The spectral characteristics of the proposed structure are analyzed via the finite element method (FEM). The results show that there is a sharp Fano resonance profile and electromagnetically induced transparency (EIT)-like effect, which are excited by a coupling between the MIM bus waveguide with a stub and the racetrack ring resonator. The normalized HZ field is affected by the displacement of the ring from the stub x greatly. The influence of the geometric parameters of the sensor design on the sensing performance is discussed. The sensitivity of the proposed structure can reach 1774 nm/RIU with a figure of merit of 61. The proposed structure has potential in nanophotonic sensing applications.

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“…However, these WGs put up with high propagation loss due to the presence of the metal as the main building block of the WG [24]. There are several other applications based on the principle of plasmonics [25][26][27]. The hybrid plasmonic WG (HPWG) structure can provide a way out related to the low evanescent field and high propagation loss.…”

Section: Introductionmentioning

confidence: 99%

Polarization-Insensitive Hybrid Plasmonic Waveguide Design for Evanescent Field Absorption Gas Sensor

2020

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We propose a polarization-insensitive design of a hybrid plasmonic waveguide (HPWG) optimized at the 3.392 µm wavelength which corresponds to the absorption line of methane gas. The waveguide design is capable of providing high mode sensitivity (Smode) and evanescent field ratio (EFR) for both transverse electric (TE) and transverse magnetic (TM) hybrid modes. The modal analysis of the waveguide is performed via 2-dimension (2D) and 3-dimension (3D) finite element methods (FEMs). At optimized waveguide parameters, Smode and EFR of 0.94 and 0.704, can be obtained for the TE hybrid mode, respectively, whereas the TM hybrid mode can offer Smode and EFR of 0.86 and 0.67, respectively. The TE and TM hybrid modes power dissipation of ~3 dB can be obtained for a 20-µm-long hybrid plasmonic waveguide at the 60% gas concentration. We believe that the highly sensitive waveguide scheme proposed in this work overcomes the limitation of the polarization controlled light and can be utilized in gas sensing applications.

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Plasmonic perfect absorber based on metal nanorod arrays connected with veins

Cited by 56 publications

References 70 publications

Ultra-High Refractive Index Sensing Structure Based on a Metal-Insulator-Metal Waveguide-Coupled T-Shape Cavity with Metal Nanorod Defects

Ultra-High Refractive Index Sensing Structure Based on a Metal-Insulator-Metal Waveguide-Coupled T-Shape Cavity with Metal Nanorod Defects

A Nanosensor Based on a Metal-Insulator-Metal Bus Waveguide with a Stub Coupled with a Racetrack Ring Resonator

Polarization-Insensitive Hybrid Plasmonic Waveguide Design for Evanescent Field Absorption Gas Sensor

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