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Title: Surface third-harmonic generation at a two-photon-polymerized micro-interferometer for real-time on-chip refractive index monitoring
Authors: Kim, Seung-Woo
Sandeep, C. S. Suchand
Jiao, Jiannan
Gao, Yi
Li, Shufan
Anh, Nguyen Duy
Su, Pei-Chen
Kim, Young-Jin
Keywords: Optical Testing
Refractive Index Monitoring
Engineering::Mechanical engineering
Issue Date: 2019
Source: Jiao, J., Gao, Y., Li, S., Anh, N. D., Su, P.-C., Kim, S.-W., ... Kim, Y.-J. (2019). Surface third-harmonic generation at a two-photon-polymerized micro-interferometer for real-time on-chip refractive index monitoring. Optics Express, 27(20), 29196-. doi:10.1364/OE.27.029196
Series/Report no.: Optics Express
Abstract: A micro-interferometer based on surface third-harmonic generation (THG) at twophoton- polymerized SU-8 cuboids for real-time monitoring of the refractive index changes of target fluids, which can be easily integrated into microfluidic photonic systems, is demonstrated. The third-harmonic (TH) interferogram is selectively generated only from the target volume by a simple vertical pumping, thereby eliminating the needs for complicated coupling and alignments. The dependence of the generated TH to the input pump polarization state is thoroughly investigated. The THG efficiency by linearly polarized excitation is found to be 2.6 × 10−7, which is the most efficient at the SU-8-air interface and independent of the input polarization direction. The THG efficiency from the SU-8-air interface is 12.17 times higher than that from the glass-air interface and 4.93 times higher than that from the SU-8- glass interface. Real-time monitoring of argon gas pressure is demonstrated using the microinterferometer. The surface TH from two-photon-polymerized 3D structures offers novel design flexibility to the nonlinear optical light sources for microfluidic and microelectronic devices.
DOI: 10.1364/OE.27.029196
Rights: © 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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