Acta Optica Sinica, Volume. 26, Issue 9, 1409(2006)
NearField Subwavelength Imaging in WaveLike TwoDimensional Photonic Crystal
Nearfield subwavelength imaging based on negative refraction in wavelike twodimensional photonic crystals within infared band. The adopted rectangular isofrequency surface results in the inhomogereity of wavelike twodimensional photonic crystal unavoidably, so the imaging is confined in the nearfield region. For the lack of the circularshaped isofrequency surface in photonic crystal matching that of the incident medium, farfield imaging based on negative refraction is unavailable in wavelike twodimensional photonic crystal. The finitedifference timedomain method is used to simulate the nearfield imaging in wavelike twodimensional photonic crystal of different thickness. The resolution of 0.28λ is achieved for single point source when the thickness of photonic crystal is twice of lattice constant. The resolution will gradually degrade as the source moves beyond the nearfield domain. Meanwhile, the image is strongly confined in the nearfield region on the other side of photonic crystal in spite of the change of source position and photonic crystal thickness. In order to further demonstrate the subwavelength imaging ability of wavelike twodimensional photonic crystal, double sources are used. Resolution of 0.35λ is obtained, but the imaging quality depends on the thickness of photonic crystal greately.
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[in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese]. NearField Subwavelength Imaging in WaveLike TwoDimensional Photonic Crystal[J]. Acta Optica Sinica, 2006, 26(9): 1409