Observation of Negative Refraction and Focusing in Two-Dimensional Photonic Crystals | Zendy

Ekmel Özbay | Zendy; İrfan Bulu | Zendy; Kaan Güven | Zendy; Hümeyra Çağlayan | Zendy; Koray Aydın | Zendy

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Observation of Negative Refraction and Focusing in Two-Dimensional Photonic Crystals

Author(s) -

Ekmel Özbay,

İrfan Bulu,

Kaan Güven,

Hümeyra Çağlayan,

Koray Aydın

Publication year - 2006

Publication title -

japanese journal of applied physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.487

H-Index - 129

eISSN - 1347-4065

pISSN - 0021-4922

DOI - 10.1143/jjap.45.6064

Subject(s) - negative refraction , optics , photonic crystal , refractive index , refraction , gaussian beam , diffraction , lens (geology) , electromagnetic radiation , transverse plane , physics , photonics , total external reflection , beam (structure) , materials science , structural engineering , engineering

We experimentally and theoretically demonstrate the negative refraction and focusing of electromagnetic (EM) waves by twodimensional photonic crystal slabs at microwave frequencies. The negative refraction is observed both for transverse magnetic (TM) and transverse electric (TE) polarized incident EM waves. Gaussian beam shifting method is used to verify the negative refractive index. The Subwavelength imaging and flat lens behavior of photonic crystals are succesfully demonstrated. We have been able to overcome the diffraction limit and focus the EM waves to a spot size of 0.21λ. Metallodielectric photonic crystals are employed to increase the range of angle of incidence that results in negative refraction. Experimental results and theoretical calculations are in good agreement throughout the work. © 2006 The Japan Society of Applied Physics

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