Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Interaction Between Surface Plasmon Resonance and Inter-band Transition in Gold Thin Film

금 박막에서 표면 플라즈몬 공명과 국소적 밴드 간 천이의 상호작용

  • 강대경 (경북대학교전기공학과) ;
  • ;
  • ;
  • 최봉준 (한화시스템 전자광학 2팀) ;
  • 박종후 (경북대학교전기공학과)
  • Received : 2019.07.25
  • Accepted : 2019.07.28
  • Published : 2019.07.31
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Abstract

The effect of inter-band transition on surface plasmon resonance in gold thin film was investigated. We induced localized inter-band transition in the film by using incident light on its surface from a green laser (532 nm) source, and the surface plasmon resonance for inter-band transition was investigated at different wavelengths. It was determined that the reflectivity of blue light (450 nm) was significantly reduced in the region where the green laser was incident. We demonstrated that this decrease is mainly due to the coupling between the blue light and the surface plasmon resonance of excited electrons in higher energy states, based on experimental results for the incident and polarization angle-dependent reflectivity of the blue light.

Keywords

HSSHBT_2019_v28n4_262_f0001.png 이미지

Fig. 1. Measurement setup for the surface plasmon resonance and the inter-band transition

HSSHBT_2019_v28n4_262_f0002.png 이미지

Fig. 2. Surface plasmon extinction curve for a gold/air interface measured at wavelengths of red, green, and blue

HSSHBT_2019_v28n4_262_f0003.png 이미지

Fig. 4. The reflectivity differences of the blue wavelength light as a function of polarization angle of incident light

HSSHBT_2019_v28n4_262_f0004.png 이미지

Fig. 3. (a) Surface plasmon resonance image with green laser OFF(upper panel) and ON (lower panel). The right figures show RGB intensities along the line passing the center of the CCD image. (b) The normalized intensity difference between when the green laser is ON(inter-band transition) and OFF

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