Research on A High-Sensitivity Temperature Sensor with Multi-Indicator Based on Nano-Cylinder-Loaded Ring Resonator

Abstract

Increasing sensor sensitivity and maintaining a large FOM (figure of merit) are challenging to achieve at the same time. Adding grooves and asymmetrical structures to the annular cavity increases sensitivity; however, it usually makes the FOM of the structure decrease. Herein, we propose a MIM (metal-insulator-metal) sensor of a novel structure with nano-cylinders loaded in a ring resonator (NCRR), whose sensitivity can reach as high as 3636.4 nm/RIU (refractive index unit). The FOM is maintained around 2000 in the mid-infrared (MIR) region. We find that grating effects only occur in the ring cavity when the cylinder’s distance is below three times its radius, and it can improve the sensitivity of the proposed structure up to 42.3% without decreasing its FOM. In addition, results suggest that our sensor has excellent resistance to eccentricity, which brings in manufacturing. Furthermore, we investigate the capability of the proposed device as a temperature sensor with ethanol, which exhibits a maximum temperature sensitivity of 1.48 nm/∘C. We believe that our research has essential application prospects in miniature integrated sensors, optical switches, splitters, filters, and broadband passers.

Tunable artificial plasmonic nanolaser with wide spectrum emission operating at room temperature

“…We choose Au instead of silver to avoid oxidation-induced losses in the resonant cavity. [19][20][21][22] The excitation condition of the plasmonic nanolaser should satisfy Γ s g s > Γ m α m , where Γ s and Γ m represent the optical confinement factors in the gain medium and metal, respectively, g s is the CdSe gain layer, and α m is the metal absorption loss. The absorption of metal is as high as 10 6 cm −1 , while that of the CdSe gain layer is on the order of 10 4 cm −1 .…”

A High-Quality Optical Sensor with High Resolution Based on Coin-like Resonator

“…Regarding the material parameter, the dielectric's relative permittivity is set as ε d = 1. For silver, the Drude model [11,28] can be utilized to characterize it in the NIR region. The Drude model is expressed as follows:…”

“…For example, ethanol has a melting point of −114.3 °C and a boiling point of 78.4 °C, which covers the most possible temperature on earth, making it a suitable dielectric for sensing. The refractive index of ethanol can be expressed as [28] 𝑛 𝑇 = 1.36048 − 3.94 × 10 𝑇 − 𝑇 where T0 is room temperature (20 °C), and T is the ambient temperature. Figure 3a where ∆𝑇′ represent the transmission rate change and T' representing the transmission rate in the spectrum [31].…”

“…For example, ethanol has a melting point of −114.3 • C and a boiling point of 78.4 • C, which covers the most possible temperature on earth, making it a suitable dielectric for sensing. The refractive index of ethanol can be expressed as [28] n Ethanol (T) = 1.36048 − 3.94 × 10 −4 (T − T 0 ) where T 0 is room temperature (20 • C), and T is the ambient temperature. Figure 3a illustrates the transmittance profile from T = −60 • C to T = 60 • C with a step of 40 • C. Sensitivity is defined as S = ∆λ/∆T, where ∆λ is the change is resonance wavelength and ∆T represent the temperature change.…”

Design and analysis of dual‐band plasmonic band pass filter using meandering step impedance resonator

“…In recent years, plasmonic has been presented as a future technology in photonic integrated circuits. Photonic structures like grating, 5 multislot line, 6 periodic array of nano cavity, 7 and saw tooth‐shaped array 8 are the most common way to design a frequency selective device. In the last decade, several multiple interface systems have been realized for optical waveguides such as metal–insulator (MI), 9 insulator–metal–insulator, 10 piezoelectric material systems, 11–13 and metal–insulator–metal (MIM) 14 .…”