The present invention provides a locking device and a high voltage shield connector having the same. Specifically, we have built a THz logic block by combining two double-sided corrugated waveguides capable of slowing down the electromagnetic waves in the THz regime with a sub-wavelength cavity, having one or more grooves with shorter height than the grooves of the periodic corrugated waveguide. , within about 10 minutes prior to ingestion of a meal, on a chronic basis.