scholarly journals Ultrahigh Sensitivity Mach−Zehnder Interferometer Sensor Based on a Weak One-Dimensional Field Confinement Silica Waveguide

Sensors ◽  
2021 ◽  
Vol 21 (19) ◽  
pp. 6600
Author(s):  
Chenming Zhao ◽  
Lei Xu ◽  
Liying Liu
Keyword(s):  
Refractive Index ◽  
Aspect Ratio ◽  
Limit Of Detection ◽  
Evanescent Field ◽  
Zehnder Interferometer ◽  
One Dimensional ◽  
Refractive Index Difference ◽  
Ultrahigh Sensitivity ◽  
Low Refractive Index ◽  
Mach Zehnder Interferometer

We report a novel Mach−Zehnder interferometer (MZI) sensor that utilizes a weak one-dimensional field confinement silica waveguide (WCSW). The WCSW has a large horizontal and vertical aspect ratio and low refractive index difference, which features easy preparation and a large evanescent field for achieving high waveguide sensitivity. We experimentally achieved WCSW ultrahigh waveguide sensitivity of 0.94, MZI sensitivity of 44,364 π/RIU and a low limit of detection (LOD) of 6.1 × 10−7 RIU.

scholarly journals Evanescent Field Controllable MZ Sensor via Femtosecond Laser Processing and Mechanic Polishing

Micromachines ◽  
2021 ◽  
Vol 12 (11) ◽  
pp. 1421
Author(s):  
Zong-Da Zhang ◽  
Yan-Zhao Duan ◽  
Qi Guo ◽  
Si Gao ◽  
Bing-Rong Gao
Keyword(s):  
Refractive Index ◽  
Femtosecond Laser ◽  
Optical Sensors ◽  
Light Propagation ◽  
Bulk Material ◽  
Measurement Range ◽  
Evanescent Field ◽  
Zehnder Interferometer ◽  
On Chip ◽  
Mach Zehnder Interferometer

Recently, optical sensors interacting with evanescent fields and the external environment around waveguides have attracted extensive attention. In the process of light propagation in the waveguide, the depth of the evanescent field is closely related to the accuracy of the optical sensor, and adjusting the depth of the evanescent field to obtain higher accuracy has become the primary challenge in fabricating on-chip optical sensors. In this study, the waveguide structure of a Mach–Zehnder interferometer was written directly in Corning Eagle 2000 borosilicate glass by a femtosecond laser, and the sensing window was exposed out of the bulk material by mechanical polishing. The refractive index detection device based on the proposed on-chip Mach–Zehnder interferometer has the advantages of small volume, light weight, and good stability. Its sensitivity can reach 206 nm/RIU or 337 dB/RIU, and the theoretical maximum measurement range is 1–1.508. Therefore, it can measure the refractive index quickly and accurately in extreme or complex environments, and has excellent application prospects.

Manipulation of thermal radiation by using photonic crystals

2021 ◽  
pp. 2150262
Author(s):  
Azka Umar ◽  
Chun Jiang
Keyword(s):  
Numerical Simulation ◽  
Refractive Index ◽  
Photonic Crystal ◽  
Photonic Crystals ◽  
Thermal Emission ◽  
Heat Energy ◽  
Radiation Loss ◽  
One Dimensional ◽  
Waveguide Core ◽  
Low Refractive Index

This paper focuses on manipulating thermal emission and radiation loss of heat energy in a heat waveguide. A One-Dimensional Photonic Crystal is used as a waveguide clad to prohibit the thermal emission from escaping. The model may reduce the radiation loss of heat energy in the waveguide core, and heat energy can be confined to propagate along the waveguide’s longitude axis. The waveguide clad comprises alternative layers of high and low refractive index materials containing sufficient electromagnetic stop bands to trap the thermal emission from escaping out of the waveguide. The numerical simulation of the model shows that the forbidden bandgap of photonic crystal structures with alternative layers of silica and silicon has width enough to make heat energy be confined within the waveguide core so that efficient heat energy transmission can be achieved along the longitude axis of the waveguide.

Sign in / Sign up

Export Citation Format

Share Document