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1. Plasma-assisted light bullets and wavelength scaling of laser filamentation in the long-wavelength infrared

   Grynko, Rostislav; Nagar, Garima; Shim, Bonggu (October 2018, APS Division of Plasma Physics Meeting 2018)

   We model laser filamentation in ZnSe in the mid-infrared (Mid-IR, wavelengths λ = 4 and 6 μm) and the long-wavelength infrared (LWIR, λ = 8 and 10 μm) using carrier-resolved unidirectional pulse propagation equations (UPPE). We predict an unprecedented propagation regime at λ = 8 μm that supports light bullets, which are spatio-temporally non-spreading electromagnetic pulses. Furthermore, in contrast to the previous report in air in the mid-IR, we predict that LWIR light bullets in solids critically rely on plasma-mediated dispersion, which dynamically evolves during multiphoton and tunneling ionization as peak plasma densities reach ρ 6.6 ×10^18 cm-3 . Finally, the plasma-assisted light bullets propagate with sub-cycle pulse durations and peak intensities I = 1.1 ×10^12 W /cm^2 , making them useful for high-harmonic generation and attosecond pulse generation. 

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2. Advances in Long Wavelength Interband Cascade Lasers

   https://doi.org/10.23919/ISLC52947.2022.9943363  

   Massengale, J. A.; Shen, Yixuan; Yang, R. Q.; Hawkins, S. D.; Klem, J. F. (October 2022, 2022 28th International Semiconductor Laser Conference (ISLC))
3. 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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4. Wavelength-by-Wavelength Temperature-Independent Thermal Radiation Utilizing an Insulator–Metal Transition

   https://doi.org/10.1021/acsphotonics.2c00500  

   King, Jonathan L.; Shahsafi, Alireza; Zhang, Zhen; Wan, Chenghao; Xiao, Yuzhe; Huang, Chengzi; Sun, Yifei; Roney, Patrick J.; Ramanathan, Shriram; Kats, Mikhail A. (August 2022, ACS Photonics)
5. Long-Wavelength Fluctuations in Quasi-2D Supercooled Liquids

   https://doi.org/10.1021/acs.jpcb.2c07417  

   Roberts, Ryan C.; Palmer, Jeremy C.; Conrad, Jacinta C. (February 2023, The Journal of Physical Chemistry B)