Patent ID: 8126305

Claim:
An electromagnetic wave propagating structure adapted for use in an electromagnetic wave propagating system that includes a wave emanating block, from which an electromagnetic wave having a wavelength is adapted to propagate in a wave-propagating direction, and a wave receiving block, said electromagnetic wave propagating structure comprising: a main body that has surfaces capable of blocking propagation of the electromagnetic wave and that includes an incident side and an exit side opposite to said incident side in the wave-propagating direction, said main body being formed with two wave-propagating channels that are spaced apart from each other, each of said wave-propagating channels extending from said incident side to said exit side and having an inner dimension not greater than half of the wavelength of the electromagnetic wave, wherein a distance between said wave-propagating channels is sufficient such that said electromagnetic wave propagating structure is adapted to allow an electromagnetic wave to propagate from the wave emanating block therethrough via said wave-propagating channels toward the wave receiving block for focusing into a light spot having a spot size that is smaller than half of the wavelength of the electromagnetic wave, wherein said main body defines a central axis in the wave-propagating direction, each of said wave-propagating channels having an incident opening at said incident side of said main body, an exit opening at said exit side of said main body, and an inner portion that extends between said incident and exit openings, that defines a central line parallel to the central axis, said exit opening of each of said wave-propagating channels being asymmetrical about the central line of the corresponding wave-propagating channel, and wherein said exit opening of each of said wave-propagating channels has first and second halves about the central line, said first half being proximate to the central axis of said main body, said second half being distal from the central axis, said first half having a dimension greater than that of said second half.