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We investigate how a single resonator with a time-modulated componentextracts power from an external ambient source. However, the collected power islargely dependent on the precise choice of the modulation signal frequency. Wefocus on the power absorbed from external vibration using a onedegree-of-freedom mechanical resonator where the damper has a time-varyingcomponent. We show that time modulation can make a significant difference inthe amount of harvested power, leading to more than 10 times enhancement withrespect to an analogous system without time modulation. We also find that anarrow band pair of peak and dip in the spectrum of the absorbed power occursbecause of the presence of an exceptional point of degeneracy (EPD). In thisnarrow frequency range, the delay between the damper modulating signal and theexternal vibrating signal largely affects the collected power. The highfrequency-selectivity of EPD-induced power management could potentially be usedin sensing and spectrometer applications.

Time Modulation to Manage and Increase the Power Harvested From External Vibrations