An electromagnetic resonance device includes an input reflector, an output
reflector, and a negative index material (NIM) disposed between the input
reflector and the output reflector. The input reflector and output
reflector are configured to be reflective to radiation having a
wavelength of interest. The NIM is configured to have a negative
refraction at the wavelength of interest. A first radiation is reflected
by the input reflector toward the first surface of the NIM, passes
through the NIM, and is focused on the output reflector as a second
radiation. The second radiation is reflected by the output reflector
toward the second surface of the NIM, passes through the NIM, and is
focused on the input reflector as the first radiation. A gain medium may
be included to amplify the first radiation and the second radiation to
generate a laser radiation.