scholarly journals A multichannel color filter with the functions of optical sensor and switch

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yuan-Fong Chou Chau ◽  
Chung-Ting Chou Chao ◽  
Hung Ji Huang ◽  
Sy-Hann Chen ◽  
Tsung Sheng Kao ◽  
...  
Keyword(s):  
Optical Sensor ◽  
Optical Switch ◽  
Structural Parameters ◽  
Extinction Ratio ◽  
Ultra Violet ◽  
Color Filter ◽  
The Finite Element Method ◽  
Sensor Performance ◽  
Nanophotonic Device ◽  
Metal Insulator Metal

AbstractThis paper reports a multichannel color filter with the functions of optical sensor and switch. The proposed structure comprises a metal–insulator–metal (MIM) bus waveguide side-couples to six circular cavities with different sizes for filtering ultra-violet and visible lights into individual colors in the wavelength range of 350–700 nm. We used the finite element method to analyze the electromagnetic field distributions and transmittance properties by varying the structural parameters in detail. The designed plasmonic filter takes advantage of filtering out different colors since the light-matter resonance and interference between the surface plasmon polaritons (SPPs) modes within the six cavities. Results show that the designed structure can preferentially select the desired colors and confine the SPPS modes in one of the cavities. This designed structure can filter eleven color channels with a small full width at half maximum (FWHM) ~ 2 nm. Furthermore, the maximum values of sensitivity, figure of merit, quality factor, dipping strength, and extinction ratio can achieve of 700 nm/RIU, 350 1/RIU, 349.0, 65.04%, and 174.50 dB, respectively, revealing the excellent functions of sensor performance and optical switch, and offering a chance for designing a beneficial nanophotonic device.

Multiple Fano resonances based on clockwork spring-shaped resonator for refractive index sensing

2021 ◽  
Author(s):  
Jinghui Ding ◽  
Yunping Qi ◽  
Yujiao Yuan ◽  
Haowen Chen ◽  
Weiming Liu ◽  
...  
Keyword(s):  
Surface Plasmon ◽  
High Performance ◽  
Figure Of Merit ◽  
Structural Parameters ◽  
The Finite Element Method ◽  
Resonant Line ◽  
Coupled Mode ◽  
Metal Insulator Metal ◽  
Mim Waveguide ◽  
Best Parameters

Abstract A surface plasmon polarized structure consisting of two metal-insulator-metal (MIM) waveguide coupled with clockwork spring-shaped resonators are constructed in this paper, and its geometric parameters are controlled within a few hundred nanometers. The finite element method (FEM) and multimode interference coupled mode theory (MICMT) are used to simulate and theoretically calculate the optical response of the designed structure. By modifying the structural parameters of the system, the influence on the asymmetry of the Fano resonance line is studied. The changes of the transmission spectra at different refractive indexes are also investigated. Based on this asymmetric resonant line, the sensitivity and FOM* (figure of merit) value of the cavity with different parameters are measured. The sensitivity and FOM* under the best parameters are 1200 nm/RIU and 191.6, respectively. The surface plasmon structure proposed and the results in this paper are promising for applications in the field of high-performance sensing and micro-nano optical devices.

scholarly journals A High-Efficiency Multispectral Filter Based on Plasmonic Hybridization between Two Cascaded Ultrathin Nanogratings

Molecules ◽  
2019 ◽  
Vol 24 (11) ◽  
pp. 2038 ◽  
Author(s):  
Bo Zhao ◽  
Zhenfen Huang ◽  
Jianjun Yang ◽  
Lei Zhang ◽  
Rajagopal S. Joshya ◽  
...  
Keyword(s):  
Multispectral Imaging ◽  
High Efficiency ◽  
Structural Parameters ◽  
Near Field ◽  
Color Filter ◽  
High Signal ◽  
Metal Waveguide ◽  
Metal Insulator Metal ◽  
Peak Transmission ◽  
20 Nm

Overcoming the disadvantages of low transmission and broad peak bandwidth of previously reported plasmonic color filters, a high-efficiency multispectral plasmonic color filter is theoretically proposed with two cascaded ultrathin metallic nanogratings separated by two heterogeneous dielectric layers, and its optical properties are theoretically investigated using the finite-difference time-domain method. The transmission spectrum presents three near-unity peak bands accompanied with three near-null dip bands adjacent around them. Both transmission efficiencies of above 90% and ultranarrow peak bandwidth of 20 nm are achieved in the visible regime. The peak band positions can be flexibly tailored by varying the structural parameters. The filter selects the visible color with high signal noise ratio at the peak bands. The outstanding spectral properties of this filter indicate significant improvement for the high-accuracy color filtering and multispectral imaging applications. The simulated near-field electromagnetic distributions suggest that the excitation of the hybrid antisymmetric surface plasmon polariton (SPP) leaky mode and metal-insulator-metal waveguide modes are responsible for the peak transmission bands, while the formation of the hybrid SPP bound modes confined on the bottom nanograting makes the dip transmission bands, all of which are the consequence of the plasmonic hybridization between the two neighboring metallic nanogratings.

scholarly journals Plasmonic Refractive Index Sensor Optimized for Color Detection

2021 ◽  
Author(s):  
Ahmad Azuad Yaseer ◽  
Md. Farhad Hassan ◽  
Infiter Tathfif ◽  
Kazi Sharmeen Rashid ◽  
Rakibul Hasan Sagor
Keyword(s):  
Refractive Index ◽  
Figure Of Merit ◽  
Structural Parameters ◽  
Color Filter ◽  
Refractive Index Sensor ◽  
Plasmonic Sensor ◽  
Metal Insulator ◽  
Initial Sensitivity ◽  
Metal Insulator Metal ◽  
Color Detection

Abstract In this paper, a six cavity-based metal-insulator-metal plasmonic sensor is proposed. The designed sensor can detect six primary colors in the visible wavelength. Moreover, the proposed sensor can also sense the change in the refractive index. An initial sensitivity of 648.41 nm/RIU and figure of merit of (FOM) 141.29 are found based on the transmittance profile extracted through the two-dimensional (2D) finite element method (FEM). The structural parameters are optimized to maximize the performance of the modeled device both as a color filter and a refractive index sensor. The optimized FOM, FOM* and sensitivity are recorded as 218.80, 4.771 × 10⁴, and 865.31 nm/RIU, respectively. Due to high FOM and FOM*, this sensor is expected to be utilized as a color filter in various sectors, such as medical, industrial, and forensic, where the light of a particular wavelength is mandatory.

scholarly journals Design of Multifunctional Janus Metasurface Based on Subwavelength Grating

Nanomaterials ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 1034
Author(s):  
Ruonan Ji ◽  
Chuan Jin ◽  
Kun Song ◽  
Shao-Wei Wang ◽  
Xiaopeng Zhao
Keyword(s):  
High Efficiency ◽  
Structural Parameters ◽  
Extinction Ratio ◽  
Bottom Layer ◽  
Subwavelength Grating ◽  
Operational Mechanism ◽  
Metal Insulator Metal ◽  
Linearly Polarized ◽  
Selection Property ◽  
Focusing Lens

In this paper, a Janus metasurface is designed by breaking the structural symmetry based on the polarization selection property of subwavelength grating. The structure comprises three layers: a top layer having a metallic nanostructure, a dielectric spacer, and a bottom layer having subwavelength grating. For a forward incidence, the metal-insulator-metal (MIM) structure operates as a gap plasmonic cavity if the linearly polarized (LP) component is parallel to the grating wires. It also acts as a high-efficiency dual-layer grating polarizer for the orthogonal LP component. For the backward incidence, the high reflectance of the grating blocks the function of the gap plasmonic cavity, leading to its pure functioning as a polarizer. A bifunctional Janus metasurface for 45 degrees beam deflector and polarizer, with a transmission of 0.87 and extinction ratio of 3840, is designed at 1.55 μm and is investigated to prove the validity of the proposed strategy. Moreover, the proposed metasurface can be cascaded to achieve more flexible functions since these functions are independent in terms of operational mechanism and structural parameters. A trifunctional Janus metasurface that acts as a focusing lens, as a reflector, and as a polarizer is designed based on this strategy. The proposed metasurface and the design strategy provide convenience and flexibility in the design of multifunctional, miniaturized, and integrated optical components for polarization-related analysis and for detection systems.

A Study of the Anchor Effect Based on Structural Parameters of Flexible Pressurized Anchor and Pressure from Surrounding Rock

2011 ◽  
Vol 71-78 ◽  
pp. 4634-4637
Author(s):  
Tian Lin Cui ◽  
Jing Kun Pi ◽  
Yong Hui Liu ◽  
Zhen Hua He
Keyword(s):  
Structural Parameters ◽  
Structural Features ◽  
Surrounding Rock ◽  
Design Parameters ◽  
Optimized Design ◽  
Anchor Effect ◽  
The Finite Element Method ◽  
Anchor System ◽  
New Type ◽  
Stress Relation

In order to optimize the design of flexible pressurized anchor, this paper gives a further analysis on structural features of the new type of flexible pressurized anchor and carries out a contact analysis on anchor system by using the finite element method. It calculates as well as researches the contact stress relation of interactional anchor rod and surrounding rock under the circumstance of anchoring, obtaining the law of all major design parameters of anchor rod structure and pressure from surrounding rock influencing the anchoring performance and arriving at the conclusion that the anchor rod is adapted to various conditions of surrounding rock. They not only serve as important references for optimized design and application of anchor rod, but also provide a basis for the experiment of new type of anchor rod.

scholarly journals A Quality Discriminaton within Ultra Violet Spectrum using Optical Sensor for Selected Commercial Oils

2018 ◽  
Vol 201 ◽  
pp. 03002
Author(s):  
Khadijah Ismail ◽  
Wardah Abdul Razak
Keyword(s):  
Molecular Structure ◽  
Optical Sensor ◽  
Absorption Rate ◽  
Oil Quality ◽  
Ultra Violet ◽  
Electron Transition ◽  
Analytical Instrument ◽  
Uv Spectrum ◽  
Main Compound ◽  
Lemongrass Oil

Nowadays ultra violet-visible (UV-Vis) spectrophotometers are widely used and is one of an important analytical instrument in modern day research. This work is conducted to determine oil quality discrimination of different selected oils using optical sensor, where the oil samples are analyzed within ultra violet (UV) spectrum, which ranges from 200nm to 400nm wavelengths. The oils extracted from five plants are analyzed based on the light absorption rate at different wavelengths. Different energy value is required for electron transition from lower level to the higher, due to different molecular structure of the main compound in the oil. The highest absorption rate at wavelength 393 nm is achieved from lemongrass oil, whereas the lowest absorption peak at 368 nm is observed from ginger oil.

scholarly journals Tunable Infrared Optical Switch Based on Vanadium Dioxide

Nanomaterials ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 2988
Author(s):  
Qi Wang ◽  
Shijie Zhang ◽  
Chen Wang ◽  
Rui Li ◽  
Tianhan Cai ◽  
...  
Keyword(s):  
Thin Film ◽  
Vanadium Dioxide ◽  
Optical Switching ◽  
Modulation Depth ◽  
Optical Switch ◽  
Extinction Ratio ◽  
Infrared Region ◽  
Metallic Phase ◽  
Ultrafast Switching ◽  
Difference Time

A tunable infrared optical switch based on a plasmonic structure consisting of aluminum nanoarrays with a thin film of vanadium dioxide is proposed. This optical switch can realize arbitrary wavelength-selective optical switching in the mid-infrared region by altering the radii of the aluminum nanoarrays. Furthermore, since vanadium dioxide transforms from its low-temperature insulator phase to a high-temperature metallic phase when heated or applied voltage, the optical switch can achieve two-way switching of its “ON” and “OFF” modes. Finite-difference time-domain software is used to simulate the performance of the proposed infrared optical switch. Simulation results show that the switch offers excellent optical performances, that the modulation depth can reach up to 99.4%, and that the extinction ratio exceeds −22.16 dB. In addition, the phase transition time of vanadium dioxide is on the femtosecond scale, which means that this optical switch based on a vanadium dioxide thin film can be used for ultrafast switching.

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

Micromachines ◽  
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.

scholarly journals Effect of combination of dye carotene and phycocyanin using daucus carota and spirulina sp. on optical sensor performance

2020 ◽  
Vol 17 (2) ◽  
pp. 907
Author(s):  
Rahmadwati Rahmadwati ◽  
Luthfiyah Rachmawati ◽  
Panca Mudjirahardjo ◽  
Eka Maulana
Keyword(s):  
Optical Sensors ◽  
Optical Sensor ◽  
Daucus Carota ◽  
Spin Coating ◽  
Deposition Method ◽  
Mercury Lamp ◽  
Current Output ◽  
Sensor Performance ◽  
Absorption Of Light ◽  
Light Absorbance

<span>This research designed optical sensors using mercury lamp of 160W. These sensors provided voltage and current output. The design of optical sensors used the organic based material,i.e. dye  carotene and phycocyanin. Fabrication of optical sensor in this research used spin coating deposition method. Based on the results of absorbance test, dye carotene had the largest absorption of light of 2.882 (a.u).  Dye phycocyanin at length had the largest absorption of light of 2.787 (a.u). Combination between dye carotene and phycocyanin, for a 3: 1 (Carotene: Phycocyanin) ratio had a waveform like a dye carotene with a peak of 2.587 (au), whereas for 1: 3 had a waveform like phycocyanin with a peak of 2,279 (au). But, sample 1: 1 ratio had decrement the light absorbance rate with peaks of 1.183 (au). At the voltage testing result, combination of phycocyanin: carotene (1:3) had the best linearity. The response time of dye 3:1 (phycocyanin: carotene), 1:1, 1:3, phycocyanin, and carotene were 6.72 s, 2.469s, 1.171s, 2.66s and 7.01s respectively. </span>

Modeling of Characteristics of Magneto-Optical Sensor Using FEM and Dipole Model for Nondestructive Evaluation

2005 ◽  
Vol 297-300 ◽  
pp. 2022-2027 ◽  
Author(s):  
Jin Yi Lee ◽  
Ji Seoung Hwang ◽  
Tetsuo Shoji ◽  
Jae Kyoo Lim
Keyword(s):  
Optical Sensor ◽  
High Speed ◽  
Crack Depth ◽  
Image Data ◽  
Nondestructive Inspection ◽  
Dipole Model ◽  
Inspection System ◽  
Optical Intensity ◽  
The Finite Element Method ◽  
Reflected Light

The magneto-optical nondestructive inspection system (hereafter refer to as RMO system) using magneto-optical sensor (hereafter refer to as MO sensor) offers the benefits of providing image data and LMF information at the same time. Therefore this system makes it possible to carry out remote and high speed inspection of cracks from the intensity of the reflected light and to estimate the shape of a crack more effectively than by already existing methods. In other words, the shape of crack could be evaluated using image data, and crack depth can be determined by calculating the intensity of reflected light. The purposes of this study were to confirm the vertical components of leakage magnetic flux from a crack using RMO system and to verify the effects of MO sensor using the finite element method and dipole model calculation. The effectiveness of these analysis methods was compared with experiments using a RMO system and several types and sizes of the crack on plate specimens. The volume of a crack could be estimated using the optical intensity regardless of the shape of cracks.

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