Method and apparatus for modifying an electromagnetic radiation beam

An electromagnetic radiation tuning device, comprising:

• a tunable refractive medium, comprising:
• a periodic dielectric medium, comprising:
• an incident surface configured for receiving an incident radiation having an incident wavelength;
• an emitting surface configured for emitting a focused radiation at a wavelength substantially near the incident wavelength;
• and
• a periodic structure comprising a dielectric periodicity between the incident surface and the emitting surface, the periodic structure configured for providing a negative refraction of the incident radiation and focusing the focused radiation at a focal location outside the periodic dielectric medium;
• at least one first electrode operably coupled to a first surface of the periodic dielectric medium;
• and
• at least one second electrode operably coupled to a second surface of the periodic dielectric medium;
• wherein the at least one first electrode and the at least one second electrode are configured for carrying at least one electromagnetic signal developed to modify the focal location;
• an input waveguide configured for directing the incident radiation to the incident surface;
• and
• at least one output waveguide configured for directing the focused radiation.

A method of modifying an electromagnetic radiation beam, comprising:

• providing a periodic dielectric medium comprising a negative refractive index at a wavelength of an incident radiation;
• directing the incident radiation at an incident surface of the periodic dielectric medium;
• generating a focused radiation at a focal location outside the periodic dielectric medium by a negative refraction of the incident radiation in the periodic dielectric medium;
• applying at least one electromagnetic signal to at least a portion of the periodic dielectric medium;
• and
• modifying the focal location in response to the at least one electromagnetic signal.