The micro-iris is an electro-chemical equivalent to the bulky, mechanical blades that are usually found in cameras and has very low power consumption, making it an ideal component for a wide-range of camera-integrated consumer devices.

In the human eye, the iris controls the diameter of the pupil and subsequently the amount of light that reaches the retina.

The purpose of an iris, or aperture stop, in a camera is exactly the same; it controls the amount of light that reaches a camera's sensors, which affects the overall focus of the image.

Traditionally, cameras have contained a set of overlapping blades that are mechanically moved to change the size of the hole - or aperture - through which light enters.

However, with the rising popularity of small, compact and lightweight consumer devices that are integrated with cameras, it has been almost impossible to miniaturize these mechanical systems.

The researchers, from the University of Kaiserslautern, have proposed an alternative method using an electro chromic material.

This material, which is often referred to as "smart glass", transforms from a transparent material into an opaque material when a small electrical voltage is applied to it.

In their study, the researchers fabricated a micro-iris using two glass substrates sandwiched together, and with each one carrying a thin film of electro chromic material, called PEDOT, on an underlying transparent electrode.

The micro-iris was 55 micrometre thick and could be switched into an opaque state using a current of 20 micro-ampere with a voltage of 1.5 V.

The micro-iris exhibited a memory effect and did not require a continuous current to maintain the opaque state, so its power consumption remained very small.

In addition to testing the intensity of light that passed through the micro-iris, as well as the amount of time it took to switch between different states, the researchers also examined the depth of focus that the micro-iris was able to impart in comparison to a traditional blade-based iris.

"There is currently no technological solution available that meets all the demands of integrated iris apertures in smartphones," lead author of the research Tobias Deutschmann said.

"Many of the proposed devices require the motion of a strong absorbing material to block the path of light. Electro chromic materials, as used in this study, remain stationary whilst they change their absorption, so there is no need for any actuation. This allows for much smaller casings to fit around the devices and thus enables the integration into tiny camera systems," said Deutschmann.

The research was published in the Journal of Optics.