Electrically tuning soft membranes to both a higher and a lower transparency

Area of Science:

• Materials Science
• Optoelectronics
• Smart Materials

Background:

• Electrically tunable optical transparency is crucial for smart windows and light diffusers.
• Current methods offer limited control, either increasing or decreasing transparency.

Purpose of the Study:

• To present a novel device concept for bidirectional electrical tuning of optical transparency in thin membranes.
• To demonstrate a broad tuning range for optical transmittance within a single device.

Main Methods:

• Coating a soft insulating membrane with circular and annular stretchable conductors.
• Utilizing independently addressable electrodes for dielectric elastomer actuation.
• Controlling membrane surface topography via electrical signals.

Main Results:

• Achieved electrical modulation of optical transmittance between 25% and 83%.
• Demonstrated the first concept for bidirectional electrical transparency tuning in a single device.
• The technology is applicable to various soft insulating membranes.

Conclusions:

• This novel approach enables unprecedented electrical control over optical transparency.
• The thin, lightweight, and silent operation makes it ideal for advanced applications.
• Offers significant advantages for systems requiring a broad transparency tuning range.