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(a) Scheme of square-PhC nanocavity design. (b) Top- and (c) titled-view SEM pictures of fabricated square-PhC nanocavity. The slab thickness, lattice constant, and ratio are 180 nm, 530 nm, and 0.37, respectively.
The simulated (a) relationship of mode frequency vs ratio and (b) mode profiles in electrical fields of monopole, WG, and dipole modes. The measured polarizations of monopole, WG, and dipole modes are shown in the bottom insets of (b). (c) The relationship between the measured single-mode lasing wavelength and ratio of square-PhC nanocavity. The bottom inset shows the splitting spectrum of the dipole mode.
(a) Scheme of protein adsorption on ODT-treated InGaAsP surface. The chemical formula of ODT is also shown. (b) Measured contact angles of oxide-free InGaAsP surfaces before and after ODT treatment, which are 50° and 110°, respectively.
(a) The measured single-mode lasing spectra of monopole, WG, and dipole modes (from left to right) before (solid-line) and after (bold solid-line) the protein (BSA) adsorption. (b) Scheme of protein adsorption on the entire surface of square-PhC nanocavity, including air hole sidewall, top, and bottom surfaces. (c) 3D FDTD simulated wavelength shifts of monopole, WG, and dipole modes (from top to bottom) contributed from the adsorbed protein on the entire nanocavity surface. The ratios of nanocavities in simulations are set to be 0.34, 0.30, and 0.28 for monopole, WG, and dipole modes.
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