Researchers use an optoelectronic resonator to increase the sensitivity of an electron pulse detector, which may lead to ultrafast electronic characterization of proteins and materials. Scientists from the University of Tsukuba in Japan have shown how adding a tiny resonator structure to an ultra
Researchers at the University of Tsukuba use an optoelectronic resonator to increase the sensitivity of an electron pulse detector, which may lead to ultrafast electronic characterization of proteins or materials. Credit: University of Tsukuba.
Scientists from the University of Tsukuba in Japan have shown how adding a tiny resonator structure to an ultrafast electron pulse detector reduced the intensity of terahertz radiation required to characterize the pulse duration. One method to examine these systems is to excite them with an ultrafast blast of laser light, and then immediately probe them with a very short electron pulse. Based on the way the electrons scatter off the sample as a function of the delay time between the laser and electron pulses, researchers can obtain a great deal of information about the atomic dynamics. However, characterizing the initial electron pulse is difficult and requires complex setups or high-powered THz radiation.
Similar to how a room with the right acoustics can amplify the perception of sound, a resonator can enhance the amplitude of THz radiation with wavelengths that match its size and shape. In this case, the team used a butterfly-shaped resonator, which was previously designed by an independent research group, to concentrate the energy of the pulse. Through simulations, they found that the electric field enhancement was concentrated where the “head” and the “tail” of the butterfly would be.
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