Bio-medical sensing by ultra-high quality-factor/modal-volume (Q/V) multi-slotted SOI Bragg grating cavity

Babakhani-Fard, Mohammad-Mahdi; Daraei, Ahmadreza; Hassani, Sara

doi:10.1140/epjp/s13360-022-02867-5

Cited by 2 publications

(2 citation statements)

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“…Such a concept holds the potential for advancing existing schemes of optical detection based on CD, [18,19] since other parameters can come into play, namely, the high Q factor of the DOs, the large nearfield amplification M, and the low mode volume (V) of plasmonic nanoantennas. [20][21][22][23] NH), as fully 3D nanostructures with chiral shape, exhibit a very large optical activity, even under normal incidence conditions. [24] Indeed, in our recent works we described how ordered arrays of 3D NHs can build up a chiral metacrystal, with resulting chiroptical response ruled out by out-ofplane and in-plane lattice parameters, [25] and how they can work as biomolecule sensing systems.…”

Section: Doi: 101002/advs202206930mentioning

confidence: 99%

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Surface Lattice Resonances in 3D Chiral Metacrystals for Plasmonic Sensing

et al. 2022

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Chiral lattice modes are hybrid states arising from the chiral plasmonic particles assembled in ordered arrays with opportune periodicity. These resonances exhibit dependence on excitation handedness, and their observation in plasmonic lattices is strictly related to the chiroptical features of the fundamental plasmonic unit. Here, the emergence of chiral surface lattice resonances (c‐SLRs) is shown in properly engineered arrays of nanohelices (NHs), fully three dimensional (3D) chiral nano‐objects fabricated by focused ion beam processing. By tuning the relative weight of plasmonic and photonic components in the hybrid mode, the physical mechanism of strong diffractive coupling leading to the emergence of the lattice modes is analyzed, opening the way to the engineering of chiral plasmonic systems for sensing applications. In particular, a coupling regime is identified where the combination of a large intrinsic circular dichroism (CD) of the plasmonic resonance with a well‐defined balance between the photonic quality factor (Q factor) and the plasmonic field enhancement (M) maximizes the capability of the system to discriminate refractive index (RI) changes in the surrounding medium. The results lay the foundation for exploiting CD in plasmonic lattices to high performance refractometric sensing.

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