microCavity vs equivalence principle

Microcavity is used to control the whispering-gallery-mode (WGM) microresonators based miniature sensing system wirelessly. As the photonic sensor of this system, WGM resonators have features of ultra-high quality (Q) factors and small mode volumes, which have found broad applications in photonics, such as cavity quantum electrodynamics, optomechanics, bio/chemical sensors , nonlinear optics, microlasers and non-Hermitian optics. In order to explore the potential applications in Internet of things for WGM resonators, a wireless WGM sensing system is developed, which not only integrates bulky equipment into a phone-sized embedded system, but also achieves the functionality of remote control by iPhone. This app enables you to view live transmission spectrum of WGM sensor, make measurements, and capture instruments screenshots from your iPhone.

This app represents the equivalence principle which states that gravitational and inertial forces are of a similar nature and often indistinguishable. Left rocket is moving up with constant acceleration a, and right rocket is on the some planet where the gravitational acceleration is g. If a is equal to g, the motion of a ball which is dropped in the left rocket is the same as the motion of a ball which is dropped in the right rocket; two balls experience the same constant acceleration motion. This is the simple demonstration of the equivalence principle. This app doesn't simulate the whole motion of a ball. Only falling motion is intended to show the equivalence principle.