Foundations For Microwave Engineering

Preface. Acknowledgments. Abbreviations and Acronyms. Introductory Remarks. A. Group-VI Semiconductors. B. III-V Binary Semiconductors. C. III-V Alloy Semiconductors. D. II-VI Semiconductors. E. IV-VI Semiconductors. F. Amorphous Semiconductors. Index.

Optical constants of crystalline and amorphous semiconductors : numerical data and graphical information

Recent advancements in optical biosensors for cancer detection.

Recent advancements in optical biosensors for cancer detection

Numerical optimization is an important tool in the field of computational physics in general and in nano-optics in specific. It has attracted attention with the increase in complexity of structures...

Benchmarking Five Global Optimization Approaches for Nano-optical Shape Optimization and Parameter Reconstruction

A highly sensitive plasmonic refractive index sensor based on triangular resonator

A metal–insulator–metal (MIM) waveguide coupled with two unequal vertical rectangular cavities optimized for high sensitivity is proposed in this study. Due to the interaction of the continuum and the discrete state in the waveguide mode, a Fano like profile is obtained in the transmission spectra, the shift of which is utilized to identify the material under sensing. In order to guarantee the maximum device performance, an optimization technique is imposed on the structural parameters, resulting in a maximum sensitivity of 2625.87 nm/RIU and figure of merit (FOM) of 26.04. The sensor has been exploited to determine the human blood group by using the refractive index model proposed for different blood groups A, B, and O. Furthermore, this structure can also be used as a temperature sensor with the temperature sensitivity of $$-1.04 \, \hbox {nm}/^\circ \hbox {C}$$
 . The excellent performance along with the blood sensing and temperature sensing capabilities of the device paves the way toward refractive index sensors that have not only been utilized in microchip processors but also a wide range of biomedical applications.

Highly sensitive refractive index sensor optimized for blood group sensing utilizing the Fano resonance

A highly sensitive sensor focused on two Metal-Insulator-Metal (MIM) waveguides and three quadrilateral cavities sandwiched perpendicularly in between the MIM waveguides is proposed. Fano resonance induced by the coherent superposition of the narrow band spectral response and broadband spectral response, excites the structural transmission characteristics. The Finite Element Method (FEM) is used to numerically investigate the transmission characteristics and sensitivity of the refractive index sensor for different configurations. The linear relationship between resonant wavelength and refractive index is used to sense the materials. By optimizing the structural parameters, a numerical evaluation of the refractive index sensitivity (S) up to 1556 nm/RIU, and associate figure of merit (FOM) of 14.83 is recorded. The device is also explored as a temperature sensor with 0.61 nm/°C sensitivity. Since ethanol is used as a sensing medium, the operating range of the sensor is between −114.3 °C and 78 °C, melting and boiling temperature of ethanol. To detect human blood groups using the proposed sensor, a mathematical model is developed, which shows impressive performance for the detection of human blood groups very precisely. Compact size, ultrafine sensitivity, and sharp Fano peak profile make the proposed sensor an ideal candidate for on-chip sensors.

Numerical investigation of an optimized plasmonic on-chip refractive index sensor for temperature and blood group detection

A highly sensitive refractive index sensor with metal insulator metal configuration has been proposed and numerically investigated the performance parameters. The sensor composed of a straight waveguide coupled with a ring-type regular pentagonal resonator. The maximum sensitivity observed is as high as 2325 nm/RIU with a figure of merit of 46. The sensor has been analyzed for the dielectrics whose refractive indices are between 1 to 1.02 and 1.34 to 1.40 and achieved a sensing resolution of $$4.30 \times 10^{ - 6}$$
 RIU. High sensitivity and FOM of the sensor with close-packed configuration make it suitable candidate for lab-on-chip sensing applications, biosensors, and optical applications.

Plasmonic Refractive Index Sensor Based on Ring-Type Pentagonal Resonator with High Sensitivity

An optical Metal-Insulator-Metal (MIM) pressure sensor loaded with arrays of silver nanorods (NRs) is proposed in this article. The illustrated sensor contains a straight waveguide coupled with a ladder-shaped resonator. The spectral profile of the proposed schematic is numerically analyzed utilizing the 2D Finite Element Method (FEM). When pressure is exerted upon the silver layer, the resonating area deforms and shifts the resonant wavelength. Extensive computations demonstrate that increasing the deformation shifts the resonant wavelength to the right, establishing a linear relationship. The suggested structure reports maximum pressure sensitivity of 25.4 nm/MPa. Moreover, the impact of NRs on pressure sensitivity is extensively investigated and the results indicate that the designed layout is sensitive to the size and radius of NRs, making it highly tunable. All these features make the modeled prototype a promising nanoscale solution in different fields of engineering.

Rakibul Hasan Sagor

Papers

A highly sensitive plasmonic refractive index sensor based on triangular resonator

Highly sensitive refractive index sensor optimized for blood group sensing utilizing the Fano resonance

Numerical investigation of an optimized plasmonic on-chip refractive index sensor for temperature and blood group detection

Plasmonic Refractive Index Sensor Based on Ring-Type Pentagonal Resonator with High Sensitivity

Metal-insulator-metal waveguide-based optical pressure sensor embedded with arrays of silver nanorods.