GEMS

Cloak (Metamaterial)

A plane wave will have no reflection when it passes a cloaking structure. GEMS is used to simulate both the normal and oblique incidence cases.

The basic design procedure in the simulation:

	Draw an inner cylinder
	Draw an open ring
	Generate an array using the open ring on the cylindrical surface
	Design the excitation pulse
	Set the domain size and boundary with a proper boundary condition
	Generate the adaptive mesh
	Set the incidence plane wave
	Specify the convergence criterion
	Simulate the project using PC or cluster

The basic settings in the simulation:

Option	Setting	Description
Boundary	XMin: PEC; XMax: PML; YMin: PML; YMax: PML; ZMin: PMC; ZMax: PMC	Only simulate the half of the original problem using PEC and PMC boundary
Plane wave	Incident angle: Phi=270 deg.; theta=90/135 deg. Polarization: Ex	The polarization should match the boundary
Mesh	Fine mesh inside the cloak structure	Fine mesh to describe the open ring structure
Output	Time domain field distribution in the x-y and y-z planes	To view the field behavior through the cloak structure
Simulation	PC or Cluster	A single PC can simulate the normal incidence case, and a 4/8-node cluster can simulate the oblique incidence case

Cloaking Structure Configuration

Normal Incidence Plane Wave

Oblique Incidence Plane Wave

Field Behavior Through Cloaking Structure (normal incidence)

Field Behavior Through Cloaking Structure (Obilque incidence)