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Strong coupling of dielectrics with terahertz gap plasmons within metallic nano-slots : 금속 나노구조 안에서 일어나는 테라헤르츠 갭 플라즈몬과 유전체의 상호작용 연구
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- Authors
- Advisor
- 김대식
- Major
- 자연과학대학 물리·천문학부
- Issue Date
- 2018-02
- Publisher
- 서울대학교 대학원
- Keywords
- Terahertz nano-gaps ; Gap plasmons ; Metamaterial absorber
- Description
- 학위논문 (박사)-- 서울대학교 대학원 : 자연과학대학 물리·천문학부, 2018. 2. 김대식.
- Abstract
- In this work a real metal regime of metallic nanostructures in terahertz
frequencies, where most noble metals are treated as perfect electric
conductors, is discussed.With an aid from gap plasmon modes, that is, coupling
of surface plasmons from the two metal sides forming a gap, large
amount of terahertz electric field can enter the metal with electric permittivity
of 106 when the gap is smaller than 100 nm. A method for highthroughput
fabrication of such gaps is first presented, and then peculiar optical
responses – anomalous resonance shifts and a large Ohmic absorption
– are experimentally and theoretically realized. Also, wet etching of a gap
spacer within a 5 nm gap is demonstrated, enabling aqueous nano-optic experiments
below 10 nm scale. This comprehensive study on terahertz gap
plasmon and nanogaps is expected to greatly benefit convergence of chemistry
or bio-chemistry with nano-optics, especially in sub-10 nm regime.
- Language
- English
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