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Magnetic-Field-Driven Reconfigurable Microsphere Arrays for Laser Display Pixels

Authors :
Baipeng Yin
Hao Jia
Hong Wang
Rui Chen
Lixin Xu
Yong Sheng Zhao
Chuang Zhang
Jiannian Yao
Source :
ACS nano.
Publication Year :
2022

Abstract

Reconfigurable microlaser arrays are essential to the construction of display panels where the individual pixel should be highly tunable in resonance mode, optical polarization, and lasing wavelength upon external control signals. Here we demonstrate a facile yet reliable approach to fabrication of organic microlaser pixels, in which the assembly of microsphere arrays on each pixel is controlled according to the near-field magnetostatic confinement. The geometrical configuration of diamagnetic microspheres could be readily modulated with the near-field potential traps by using the external field to alternate the saturation magnetization of the underneath micromagnet. The motion of microspheres can be modulated among several states upon applied field, and the reconfigurable microsphere array is thus achieved with high spatial precision and rapid temporal response. Moreover, both isolated and coupled spheres serve as low-threshold microlasers with tunable optical resonance modes, whereas the switching between the vertical and horizontal alignments of coupled spheres manipulates the polarization of lasing outputs. By repeating the magnetostatic confinement on the same substrate, the full-color laser display pixels with magnetically tunable color expression capability are successfully achieved.

Details

ISSN :
1936086X
Database :
OpenAIRE
Journal :
ACS nano
Accession number :
edsair.doi.dedup.....6874dd7de3e5a6c25178753d55ce3dbd