Figure | Working principle of the lobe-structured microtube resonator. (IMAGE)
Caption
Figure | Working principle of the lobe-structured microtube resonator. a, The scheme of the resonator with the "lobe" structure, illustrating the restriction of optical fields. b, Simulation results showing the axial optical field distribution and discrete energy levels created by the lobe structure, which prevents light leakage. c, Spatially resolved photocurrent measurements showing active regions in the graphene channel. d, The trade-off between Q factors and photoresponsivities for different graphene integration lengths, showing the optimized balance.
Credit
Yongfeng Mei et al.
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