Visualization 1: High-quality-factor planar optical cavities with laterally stopped, slowed, or reversed light

In this finite-difference time-domain simulation (Lumerical Inc.), a dipole emits light into "Structure A" (cf. Table 1 and Fig. 3(a)), then turns off. Much of the emitted light enters a mode which remains localized in the in-plane direction. Originally published in Optics Express on 08 August 2016 (oe-24-16-18399

Surface Propensities of Atmospherically Relevant Ions in Salt Solutions Revealed by Phase-Sensitive Sum Frequency Vibrational Spectroscopy

We use phase-sensitive sum-frequency vibrational spectroscopy (PS-SFVS) to study the air/water interfaces of a set of salt solutions. The spectra reveals the presence of an electric double layer formed by cations and anions at the interfaces, and allow us to find the <i>relative</i> surface propensities of different ions in the following decreasing ranking order: I^–, NO₃^–, NH₄⁺, Cl^–, K⁺, Na⁺, and SO₄^2-. Most of our results agree with predictions of MD simulations, but NO₃^–and NH₄⁺ do not