Low threshold current single-cell hexapole mode photonic crystal laser

The authors report an electrically driven, hexapole mode, single-cell photonic crystal laser operating at 1537.8 nm . Electrical current is supplied through a submicrometer-sized current post beneath the cavity center. This wavelength-scale single-cell photonic crystal laser operates in a single mode with threshold current of ∼ 100 μ A at room temperature. Operation in the hexapole mode is confirmed by the near-field profile, far-field polarization, and the finite-difference time-domain computation based on the fabricated cavity structure.