Fig. 2: Diamond rectangular 1D nanobeam OMC with embedded concentrator, drawing from previous examples in silicon5,7 and diamond20,47,79 as well as ultrasmall mode volume photonic and phononic crystals22,26.
From: Spin-optomechanical cavity interfaces by deep subwavelength phonon-photon confinement
a Diagram of the nanobeam photonic crystal. Free parameters include taper width b; unit cell period as a function of cell number n, a(n); unit ellipse width hx(n) and height hy(n); and beam width w alongside beam thickness t. b Plot of quadratically varying a(n), hx(n), and hy(n) on either side of the beam center. This characterizes the cavity parametrized by Table 1 later in the text. c optical and (d) mechanical bandstructure for the mirror unit cell of the cavity, providing a 28.7 THz bandgap around and a 2.41 GHz mechanical bandgap. e mechanical displacement and (f) electric field norm profiles of the 5.39 GHz mechanical mode and 200.2 THz optical mode of the cavity. These simulations are for parameters \(\{{h}_{{y}_{d}},{h}_{{x}_{d}},{a}_{d}\}=\{218.2,334.8,456.56\}\) nm, α = 135°, rest of the parameters are same as from Table 1.
