NEWS – Researchers at the Indian Institute of Science (IISc) have developed a device to convert short infrared light into visible light. The up-conversion of light has significant applications, particularly in defence and optical communications

HIGHLIGHTS

Working Principle

• The device increases the frequency of short infrared light to make it visible to the human eye.
• It utilizes a 2D material and a non-linear optical mirror stack for up-conversion, along with wide-field imaging capabilities.

Device Structure

• The device comprises a multilayered gallium selenide on a gold reflective surface, with a silicon dioxide layer in between.
• This innovative structure allows for efficient up-conversion of infrared light.

Advantages Over Traditional Methods

• Traditional infrared imaging methods use bulky and less efficient sensors, often restricted for export due to defence applications.
• The IISc device offers a more compact, efficient, and indigenous solution for infrared light up-conversion.

Methodology

• The device utilizes nonlinear optical properties to mix input infrared signals and pump beams, resulting in up-converted output light.
• It successfully converts infrared light with a wavelength of 1,550 nm to visible light at 622 nm.

Future Directions

• The researchers aim to extend the device’s capability to up-convert light of longer wavelengths.
• They also plan to enhance the device’s efficiency by exploring alternative stack geometries.

Potential Impact

• The device could revolutionize infrared imaging applications without the need for specialized infrared sensors.
• It opens doors for diverse applications in various sectors, including defence, telecommunications, and imaging technologies.