研究目的
Investigating the synthesis of flat bands by applying loss to the system and observing the associated compact localised eigenmodes in a PT-symmetric photonic lattice.
研究成果
The experimental investigation successfully demonstrated the synthesis of flat bands by applying loss to the system and observed the associated compact localised eigenmodes. This work contributes to the understanding of non-Hermitian physics in photonic systems and opens new avenues for controlling light propagation in periodic lattices.
研究不足
The study is limited to the specific setup of femtosecond laser-written photonic lattices and the particular method of introducing loss. The applicability of the findings to other systems or methods of loss introduction remains to be explored.
1：Experimental Design and Method Selection:
The experiment utilized femtosecond laser-written photonic lattices to explore non-Hermitian physics in discrete settings. The implementation of complex potentials was achieved through judiciously distributed refractive index, gain, and loss.
2：Sample Selection and Data Sources:
The samples were fabricated in fused silica with femtosecond laser pulses, introducing artificial loss by dwelling the laser at equidistant points.
3：List of Experimental Equipment and Materials:
The setup included a femtosecond laser for waveguide writing and a spatial light modulator for exciting compact localised eigenmodes.
4：Experimental Procedures and Operational Workflow:
The artificial loss was introduced by periodically dwelling the inscription beam, creating scattering dots that extract a fraction of the light without compromising the waveguide's effective refractive index. The excitation of compact localised eigenmodes was achieved by imprinting the proper phase profile between lattice sites.
5：Data Analysis Methods:
The dispersion relation for the system's Hamiltonian was analyzed to observe the emergence of a flat band at the exceptional point.
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