Publications by authors named "Jiankun Hou"
Photons with zero rest mass are impossible to be stopped. However, a pulse of light can be slowed down and even halted through strong light-matter interaction in a dispersive medium in atomic systems. Exceptional point (EP), a non-Hermitian singularity point, can introduce an abrupt transition in dispersion.
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- - The text discusses how non-Hermitian degeneracies in open physical systems lead to unique behaviors like PT symmetry breaking and enhanced sensing near exceptional points (EP).
- - The authors demonstrate an experimental increase in second-harmonic frequency (SHG) conversion by as much as 300 times along a PT symmetry line, influenced by whether the system is in a symmetric or broken phase.
- - This enhancement in SHG conversion could improve sensitive distance measurements down to nanometer precision, opening up new possibilities for applications in sensing and wave control.
The photorefractive (PR) effect plays a critical role in emerging photonic technologies, including dynamic volume holography and on-chip all-optical functionalities. Nevertheless, its slow response rate has posed a significant obstacle to its practical application. Here, we experimentally demonstrate the enhancement of the PR response rate in a high-Q thin-film lithium niobate (TFLN) microdisk under UV light irradiation.
View Article and Find Full Text PDFTwo coupled resonance modes can lead to exotic transmission spectra due to internal interference processes. Examples include electromagnetically induced transparency (EIT) in atoms and mode splitting in optics. The ability to control individual modes plays a crucial role in controlling such transmission spectra for practical applications.
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- Regional land use changes significantly affect carbon storage in ecosystems, particularly in the source region of the Yellow River, highlighting the importance of predicting these impacts for sustainable development.
- From 2000 to 2020, carbon storage in the area increased by 11.59 million tons, mainly due to the expansion of wetlands and shifts in grassland coverage.
- Projections for 2040 indicate further carbon storage increases, with the natural change scenario showing a rise of 3.92 million tons and the ecological protection scenario yielding an even larger increase of 13.53 million tons, underscoring the need for informed land use management.