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Spectrometer-based wavelength interrogation SPR imaging via Hadamard transform
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- Authors
- Soocheol Kim, Jin Hwa Ryu, Hoesung Yang, Kyuwon Han, Hyunseok Kim, Kwangsoo Cho, Soyoung Park, Sang Gi Hong, Kangbok Lee
- Issue Date
- 2023-02
- Citation
- Optics Letters, v.48, no.4, pp.992-995
- ISSN
- 0146-9592
- Publisher
- Optica Publishing Group
- Language
- English
- Type
- Journal Article
- Abstract
- We present spectrometer-based wavelength interrogation surface plasmon resonance imaging (SPRi) without mechanical scanning. A polarized broadband light source illuminates an object via a gold-coated prism; the reflected light is spatially modulated by a digital mirror device (DMD) and then measured with a spectrometer. Reflectance spectral images are reconstructed via the Hadamard transform (HT), and a refractive index (RI) map is visualized from the reflectance spectral images by analyzing the resonance peak shift of the spectrum at each image pixel. We demonstrate the feasibility of our method by evaluating the resolution, sensitivity, and dynamic detection range, experimentally obtained as ∼2.203 × 10−6 RI unit (RIU), ∼3,407 nm/RIU, and ∼0.1403 RIU, respectively. Furthermore, simulations are performed to validate the experimental results.
- KSP Keywords
- Broadband light source(BLS), Dynamic detection, Hadamard Transform, Reflected light, Resonance peak shift, SPR imaging, Spectral image, Surface plasmon(SP), Wavelength interrogation, detection range, mechanical scanning