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Micro-thermometer can record tiny temperature changes

Press Trust of India  |  Tokyo 

Scientists have developed a micrometer-wide that can measure tiny amounts of generated by light beams in real time.

The device can be applied in photo-thermal as well as in advanced research on crystals, optical light harvesting, etc.

The miniaturised system with a nanoscale source and detector is essential for future development of next-generation transistors that will be employed in designing new

The device developed by scientists at in Japan consists of a gold and nickel thermocouple on a silicon nitride membrane and is miniaturised to the extent that the electrodes are only 2.5 micrometres wide and the membrane is just 30 nanometres thick.

A thermocouple is an consisting of two dissimilar electrical conductors forming electrical junctions at differing temperatures. It produces a temperature-dependent voltage, which can be interpreted to measure

For such a system to be used as a thermometer, it must show sensitivity to change. The developed micro-thermocouple exhibited high responsiveness to generated by a and an beam.

Tiny changes were measured by the developed thermocouple for both types of heating.

To prepare the micro-thermocouple a cross pattern of with widths of a few micrometers is created. Researchers used this technique to create a pattern on a nano-thin silicon nitride membrane, which enhanced the device sensitivity and enabled it to respond faster.

Through this approach, a that could measure fast and small temperature changes was successfully produced, with the measurements being performed through the nano-thin silicon nitride membrane.

The system can be regarded as a new "toolbox" for investigating heat transport behaviour on the micro- and nano-scales, with many in a wide range of fields, researchers said.

(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)

First Published: Mon, May 14 2018. 14:45 IST