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This paper demonstrates, via simulation, an electro-optic modulator based on a subwavelength Fabry-Perot resonator cavity with ultra-low power consumption. The device is modulated at a doped p-i-n junction overlapping the cavity in a silicon waveguide perforated with etched holes, with the doping area optimized for minimum power consumption. The surface area of the entire device is only 2.1 mum2. Our optical and electrical simulations demonstrate a resonance peak shift of 12 nm with 0.5 mW power consumption. Transient results indicate that the modulation depth exceeds 10 dB at a modulation speed of 100 MHz with the power consumption comparing favorably to a previous report . This speed can be further improved to 250 MHz by using an optimized driving signal . Finally, the etched holes forming the cavity have been tapered ,  to maximize insertion, and the etching depth of those holes is tuned to reduce fabrication complexity. The device does not rely on ultra-high Q, and the huge peak shift detected could be applied to a sensor -, modulator, or passive filter with built-in calibration.