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1. Optical characterization of wavelength-shifting and scintillating-wavelength-shifting fibers

   https://doi.org/10.1088/1748-0221/21/01/P01027  

   Bae, W; Cesar, J; Chen, K; Cho, J; Du, D; Edgar, J; Earthman, W; Falana, OM; Gajda, M; Hurlbut, C; et al (January 2026, Journal of Instrumentation)

   Abstract We report results of optical characterizations of new wavelength-shifting and scintillating-wavelength-shifting fibers EJ-182 and EJ-160 from Eljen Technology and compare them to the wavelength-shifting fiber BCF-91A from Saint-Gobain. The wavelength-dependence of attenuation was derived from spectral measurements confirming that the long attenuation length increases with wavelength, while short attenuation effects become less significant at longer wavelengths. The impact of the environmental refractive index was studied by immersing the EJ-160II fiber in water. Immersing the fiber in water reduced the overall light output and suppressed the short attenuation component, which can be explained by reduced light-collection efficiency due to the smaller refractive-index contrast between the fiber cladding and the surrounding medium. 

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2. Wavelength-scale optical parametric oscillators

   https://doi.org/10.1364/OPTICA.411708  

   Jahani, Saman; Roy, Arkadev; Marandi, Alireza (January 2021, Optica)

   null (Ed.)
3. Fine-Tuning of Optical Resonance Wavelength of Surface-Micromachined Optical Ultrasound Transducer Arrays for Single-Wavelength Light Source Readout

   https://doi.org/10.3390/mi15091111  

   Yan, Zhiyu; Fang, Cheng; Zou, Jun (September 2024, Micromachines)

   This article reports the fine-tuning of the optical resonance wavelength (ORW) of surface-micromachined optical ultrasound transducer (SMOUT) arrays to enable ultrasound data readout with non-tunable interrogation light sources for photoacoustic computed tomography (PACT). Permanent ORW tuning is achieved by material deposition onto or subtraction from the top diaphragm of each element with sub-nanometer resolution. For demonstration, a SMOUT array is first fabricated, and its ORW is tuned for readout with an 808 nm laser diode (LD). Experiments are conducted to characterize the optical and acoustic performances of the elements within the center region of the SMOUT array. Two-dimensional and three-dimensional PACT (photoacoustic computed tomography) is also performed to evaluate the imaging performance of the ORW-tuned SMOUT array. The results show that the ORW tuning does not degrade the optical, acoustic, and overall imaging performances of the SMOUT elements. As a result, the fine-tuning method enables new SMOUT-based PACT systems that are low cost, compact, powerful, and even higher speed, with parallel readout capability. 

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4. Sub-wavelength optical lattice in 2D materials

   https://doi.org/10.1126/sciadv.adv2023  

   Sarkar, Supratik; Mehrabad, Mahmoud Jalali; Suárez-Forero, Daniel G; Gu, Liuxin; Flower, Christopher J; Xu, Lida; Watanabe, Kenji; Taniguchi, Takashi; Park, Suji; Jang, Houk; et al (March 2025, Science Advances)

   Recently, light-matter interaction has been vastly expanded as a control tool for inducing and enhancing many emergent nonequilibrium phenomena. However, conventional schemes for exploring such light-induced phenomena rely on uniform and diffraction-limited free-space optics, which limits the spatial resolution and the efficiency of light-matter interaction. Here, we overcome these challenges using metasurface plasmon polaritons (MPPs) to form a sub-wavelength optical lattice. Specifically, we report a “nonlocal” pump-probe scheme where MPPs are excited to induce a spatially modulated AC Stark shift for excitons in a monolayer of MoSe₂, several microns away from the illumination spot. We identify nearly two orders of magnitude reduction for the required modulation power compared to the free-space optical illumination counterpart. Moreover, we demonstrate a broadening of the excitons’ linewidth as a robust signature of MPP-induced periodic sub-diffraction modulation. Our results will allow exploring power-efficient light-induced lattice phenomena below the diffraction limit in active chip-compatible MPP architectures. 

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5. Neural Network Based Wavelength Assignment in Optical Switching

   https://doi.org/10.1145/3098593.3098600  

   Gutterman, Craig L.; Mo, Weiyang; Zhu, Shengxiang; Li, Yao; Kilper, Daniel C.; Zussman, Gil (January 2017, ACM Big-DAMA'17, Proceedings of the Workshop on Big Data Analytics and Machine Learning for Data Communication Networks)