Major reshaping of narrow beams by resonant multilayer structures
OPTICS EXPRESS, cilt.28, sa.6, ss.8211-8222, 2020 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 28 Sayı: 6
- Basım Tarihi: 2020
- Doi Numarası: 10.1364/oe.386610
- Dergi Adı: OPTICS EXPRESS
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Compendex, EMBASE, MEDLINE, Directory of Open Access Journals
- Sayfa Sayıları: ss.8211-8222
- Gazi Üniversitesi Adresli: Hayır
Özet
Major reshaping of electromagnetic MM-wave beams transmitted at resonant frequencies through high-quality multilayer structures is demonstrated. Beam reshaping emerges due to efficient excitation of intrinsic quasi-optical modes with complex spatial profiles by an incident beam. This leads to a significant increase of width and distortion of shape of transmitted beams, which grow with increasing likelihood of excitation of higher-order modes. The beam shape is extremely sensitive to imperfections of real structures and can become complex and asymmetric even at the normal-angle transmission of symmetric incident beams. The effect is of importance for the resonant MM-wave and THz spectroscopy of low-loss dielectric materials. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement