ETH Zurich Has Developed World’s Smallest Microlaser
Novel electrically pumped laser could someday revolutionize chip technology
Mr. Christoph Walther, a PhD student in the Quantum Optoelectronics Group at ETH Zurich, and his colleagues have developed the world’s smallest electrically pumped laser. The laser is 30 micrometers long, eight micrometers high, and has a wavelength of 200 micrometers. This makes the laser much smaller than the wavelength of the light it emits – which the team denotes is a scientific first.“Instead of the usual optic resonators, we use an electrical resonant circuit made up of an inductor and two capacitors”, explains Walther. The light is effectively “captured” in it and induced into self-sustaining electromagnetic oscillations on the spot using an optical amplifier.