This demo shows wireless energy transfer between Tesla coil and metal plates ( alu foil ) through the electric field.
Tesla coil generates a high-frequency high voltages. This voltage creates a strong oscillating electric field in its surroundings and induces an alternating potential on the receiver plate ( electrostatic induction ).

Capacitive Coupling – Wireless Power Transmission – Test

1. Aluminum plate is close to the coil L1

Capacity C_TA + C_LP enables capacitive coupling between the coils L1 and aluminum plate

C_TA – capacity between the top load and aluminum plates
C_LP – capacity between coil and aluminum plates

By changing the distance between L1 and aluminum plates, also changes the capacitance C_TA + C_LP, which  significantly affect the wireless power transmission.

Capacitive Coupling Wireless Power Transmission

2. Top load is at a greater distance from the coil L1

Since the coil away from the aluminum plate, capacity C_LP between the coil and aluminum plates has almost no effect.

It is also the inductive influence coils L1 fully eliminated. This and the previous experiment clearly shows that the wireless transmission of energy is fully implemented using capacitive coupling.

Capacitive Coupling

Tesla coil and capacitive power transfer