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High-Contrast Dynamic Reflecting System Based on Pneumatic Micro/Nanoscale Surface Morphing.

Yang Shen1, Qiushun Zou1, Bo Wan1

  • 1State Key Laboratory of Optoelectronic Materials and Technologies, School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China.

ACS Applied Materials & Interfaces
|December 30, 2020
PubMed
Summary

Inspired by cephalopods, a new dynamic reflecting system uses pneumatic micro/nanoscale surface morphing. This technology achieves high reflectance contrast and enables ultrasensitive optical gas pressure sensing.

Keywords:
dynamic displaydynamic reflecting systemdynamic wrinklesgas pressure sensorpneumatic actuationsurface morphing

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Area of Science:

  • Materials Science
  • Optics
  • Biomimetics

Background:

  • Cephalopods utilize dynamic skin color and pattern changes for environmental adaptation.
  • Existing optical sensors lack the sensitivity and contrast required for certain applications.

Purpose of the Study:

  • To design a novel dynamic reflecting system inspired by cephalopod skin.
  • To achieve high reflectance contrast and develop an ultrasensitive optical gas pressure sensor.

Main Methods:

  • A thin metal/elastomer bilayer modulated by a microfluidic gas injector was developed.
  • Pneumatic actuation induced a "wrinkled-specular" transition on the metal surface.
  • Optical reflectance contrast and sensor performance were measured.

Main Results:

  • An unprecedented broad-band reflectance contrast of 93 was achieved.
  • The system demonstrated excellent cycle stability (>2500 cycles) and a fast response time (∼0.2 s).
  • An ultrasensitive optical gas pressure sensor with a sensitivity of 178 kPa-1 was realized.

Conclusions:

  • The novel pneumatic micro/nanoscale surface morphing system offers significant advantages over conventional optical sensors.
  • Demonstrated applications include a curvature-variable convex mirror and a noniridescent dynamic display.
  • This technology has potential for adaptive optical devices, advanced sensors, and novel displays.