On-chip Raman spectrometers using narrow band filter array combined with CMOS image sensors

• Published in: Sensors and actuators. B, Chemical Chemical, 2023-04, Vol.381, p.133442, Article 133442
• Main Authors: Park, Yeonsang, Kim, Un Jeong, Lee, Suyeon, Kim, Hyochul, Kim, Jineun, Ma, Hyunjun, Son, Hyungbin, Yoon, Young Zoon, Lee, Jae-soong, Park, Minsu, Choo, Hyuck, Park, Q.-Han, Roh, Young-Geun
• Format: Article
• Language: English
• Subjects: CMOS image sensor; Miniaturization; Raman spectrometer; Reconstruction
• ISSN: 0925-4005; 1873-3077
• DOI: 10.1016/j.snb.2023.133442

Recent advancements in nanotechnology raise the feasibility of a miniaturized, portable Raman spectrometer with promising applications such as material identification, food safety monitoring, and health care. Miniaturizing Raman spectrometers has remained a challenge owing to the inevitable weakness of Raman signals and the conflict between small size and spectral resolution. In this study, we present a portable mini-Raman spectrometer comprising a complementary metal–oxide semiconductor (CMOS) image sensor (CIS) integrated with an array of filter sets, a confocal probe, and a laser diode that successfully meets the miniaturization challenge. We also report successful measurement of Raman spectra using the CIS-based mini-spectrometer, measuring cyclohexane liquid, tylenol pills, and vitamin-C pills with high spectral resolution. Our mini-Raman spectrometer, which can measure Raman signals in a two-dimensional (2D) image format in a single-shot, can be embedded into commercial mobile phones and transformed into a promising Raman camera. •The successful measurement of the Raman signal as a two-dimensional image using a CMOS image sensor.•Raman images were reconstructed as spectra with approximately 1.0 nm (16.21 cm−1) resolution using the developed method.•The successful demonstration of a CMOS-based miniaturized Raman spectrometer.