IŞIN YÖNLENDİRME İçin VO2'ye DAYALI AYARLANABİLİR TERAHERTZ META YÜZEY TASARIMI

Öz

Bu çalışma, ışın yönlendirme için yeni bir ayarlanabilir gradyan metasurface tasarımı sunmaktadır. Işın yönlendirmeyi sağlamak için, 900 faz farkına sahip dört optimize edilmiş meta-atom kullanılmıştır. Toplam 3600 faz kapsamı ile bu metasurface, gelen dalgayı kontrol ederek yansıyan dalgayı yönlendirebilir. Bu metasurface, meta-atomlarında VO2 malzemesinin kullanılması nedeniyle de ayarlanabilir özelliktedir. VO2 metalik haldeyken, gradyan metasurface polarizasyon dönüşümü yoluyla gelen dalgayı yönlendirebilir. Bununla birlikte, VO2 yalıtkan haldeyken, gelen dalga aynı açıda ve aynı polarizasyonla yansır. Bu nedenle, önerilen gradyan metasurface, terahertz frekans aralığında yansıma yoluyla gelen dalganın dalga cephesini ve polarizasyonunu ayarlanabilir şekilde manipüle edebilir.

Anahtar Kelimeler

• Ayarlanabilir gradyan metasurface;
• terahertz
• ışın yönlendirme
• VO2
• polarizasyon dönüşümü

TUNABLE TERAHERTZ METASURFACE DESIGN BASED On VO2 For BEAM STEERING

Öz

This study introduces a new tunable gradient metasurface design for beam steering. To achieve beam steering, four optimized meta-atoms with 900 phase difference are employed. With a total 3600 phase coverage, this metasurface can steer the reflected wave by controlling the incident wave. This metasurface is also tunable due to the use of VO2 material in its meta-atoms. When VO2 is in a metallic state, the gradient metasurface can steer the incident wave through polarization conversion. However, when VO2 is in the insulating state, the incident wave is reflected at the same angle with the same polarization. Thus, the proposed gradient metasurface can tunably manipulate the wavefront and polarization of the incident wave through reflection in the terahertz frequency range.

Anahtar Kelimeler

• Tunable gradient metasurface
• terahertz
• beam steering
• VO2
• polarization conversion

Kaynakça

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