Highly Sensitive On-Chip Grating-Based Optical Sensor on Glass Substrate: Cost-Effective Design

Abstract

This paper presents a novel on-chip optical sensing system using ion exchange technology and phase-shifted Bragg grating design. The sensor geometry has been optimized using a finite difference time domain (FDTD) solver to achieve maximum sensitivity and figure of merit (FOM). The proposed design offers high sensitivity to changes in refractive index and low fabrication costs. The ion exchange process used to create the sensor allows for precise refractive index control, optimizing the sensor’s sensitivity and FOM. A graded-index waveguide and a phase-shifted Bragg grating structure also contribute to the sensor’s high sensitivity. The proposed sensor design was tested for water-based sensing applications, achieving a FOM of 227.63 and a 343.1 nm/RIU sensitivity. These values are significantly higher than those reported for other Bragg grating sensors, highlighting the potential of the proposed design for high-performance sensing applications. The sensor’s high sensitivity and low fabrication costs make it a promising technology for future sensing and monitoring applications.

Topological Edge State Ring Resonator for Mid-Infrared(MI) Refractive Indices Biosensor for detection of Brain Tumors

“…When r1 = 255 nm and r2 = 85 nm, a large bandgap with a width of 9.5 THz is formed. 41 Figure 2b demonstrates the topological edge band within the band gap structure. As you can see the frequency of 157.44 KHz can be robust transmission in the topological state with low loss.The result is a degeneracy at the Brillouin zone's periphery, 42 which in turn causes two transmission conduction bands to exist: the topological band, shown by the blue line, and the trivial band, denoted by the orange line.…”

“…As a result, high-sensitivity and cost-effective sensors are needed to prevent the spread of this dangerous disease. 41,42 In this research, we provide a theoretical demonstration of a ring resonator biosensor device (Fig. 1) that utilizes silicon VPCs.…”