Transmission surface plasmon resonance image detection by a smartphone camera
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esearch Letter
Transmission surface plasmon resonance image detection by a smartphone camera Chutiparn Lertvachirapaiboon, Chammari Pothipor, Akira Baba, Kazunari Shinbo, and Keizo Kato, Graduate School of Science and Technology, Niigata University, 8050 Ikarashi 2-nocho, Nishi-ku, Niigata 950-2181, Japan Address all correspondence to Chutiparn Lertvachirapaiboon and Akira Baba at [email protected] and [email protected]. ac.jp (Received 12 June 2018; accepted 13 July 2018)
Abstract A transmission surface plasmon resonance image (TSPRi) obtained with a plasmonic grating structure was investigated in combination with a smartphone camera. A substrate of a gold-coated CYTOP grating/glass slide showed the TSPR excitation wavelength of 675 nm at the incident light angle of 30°. The TSPRi acquired from a smartphone camera assembled with liquid crystal tunable filters corresponded with spectroscopic results. The sensitivity of this technique was 282/RIU. Due to changes in the sensitivity of the TSPRi intensity to the refractive index of the environment, this technique can be further developed for portable devices for sensor applications.
Introduction Surface plasmon resonance-enhanced light transmission through metallic nanohole arrays was first observed in 1998 and was named transmission surface plasmon resonance (TSPR).[1] The TSPR phenomenon was also observed using a gold-coated diffraction grating.[2–14] The plasmonic nanohole arrays[1,15–24] and plasmonic grating[2–14] showed narrow transmission peaks and could be tuned over a wide wavelength range (visible to near-infrared). TSPR excitation is highly sensitive to local dielectric conditions at the metal interface and the grating momentum wave vector.[5,6] TSPR measurements have many advantages over conventional SPR techniques; for example, since the TSPR optical signal contains no optical noise originating from reflected light, distinctive TSPR peaks and dominant bright spots on a dark background indicated enhanced transmitted light and an improved signal-to-noise ratio.[2,20–22] The TSPR phenomenon has been investigated using imaging techniques.[5–7,13,18,19] Im et al. demonstrated that the transmitted intensity originating from plasmonic nanohole arrays depended on their periodicity.[18] A substrate of plasmonic nanohole arrays was coupled with a parallel microfluidic channel for protein microarray applications. A TSPR technique involving metallic nanoslit and nanohole arrays could be combined with a smartphone to record TSPR images (TSPRis).[25–27] In 2016, Lee et al. developed plasmonic biochips containing metallic nanoslit arrays for rapid label-free pesticide detection using a smartphone.[26] The sensitivity change in the optical transmitted signal was dependent on the pesticide concentration and could be recorded with a smartphone camera. By recording images and appropriately evaluating the signal, the technique could be used for pesticide
detection with a detection limit of 1 ppb. Furthermore, this technique provides a simple detection protocol,
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