Guided-mode resonance pressure sensor based on a stretchable low-density polyethylene film

Area of Science:

• Materials Science
• Optics
• Sensor Technology

Background:

• Guided-mode resonance (GMR) devices offer label-free sensing capabilities.
• Flexible and transparent substrates are desirable for advanced sensor applications.
• Developing sensitive and high-resolution pressure sensors remains a key challenge in various fields.

Purpose of the Study:

• To fabricate a novel guided-mode resonance (GMR) device on a flexible and transparent low-density polyethylene (LDPE) film.
• To evaluate the performance of the fabricated LDPE-GMR device as a pressure sensor.
• To investigate the impact of the LDPE film's flexibility on sensor sensitivity and resolution.

Main Methods:

• Fabrication of a grating structure on an LDPE film using thermal-nanoimprinting.
• Integration of a high-refractive-index titanic oxide layer onto the grating to form the GMR device.
• Characterization of the LDPE-GMR device as a pressure sensor within a gas chamber, monitoring resonance angle shifts with pressure variations.

Main Results:

• The LDPE-GMR device successfully functioned as a pressure sensor, showing a shift in resonance angle proportional to pressure changes.
• The flexible nature of the LDPE film enabled enhanced pressure detection sensitivity and resolution.
• The sensor achieved a sensitivity of 8.27 µW/mbar and a limit of detection of 0.012 mbar.

Conclusions:

• A flexible and transparent GMR pressure sensor was successfully fabricated on LDPE film.
• The LDPE-GMR sensor demonstrates significant potential for high-performance pressure sensing applications.
• The study highlights the advantages of using flexible substrates for improving sensor performance.