We report novel superlattice wave patterns at the interface of a fluid layer driven vertically. These patterns are described most naturally in terms of two interacting hexagonal sublattices. Two frequency forcing at very large aspect ratio is utilized in this work. A superlattice pattern ("superlattice-I") consisting of two hexagonal lattices oriented at a relative angle of 22o is obtained with...

Atomic coherence effects with a strong standing-wave coupling field on a four-level system of hot Rb atoms are investigated. Amplitude modulation and phase modulation of the strong standing-wave field are coherently coupled in linear and nonlinear atomic polarizations in various multi-wave mixing processes. Such coupled atomic coherence effect leads to one-photon triple-bandpass filters in an e...

The operation principle of resonant channel add–drop filters based on degenerate symmetric and antisymmetric standing-wave modes has been described elsewhere using group theoretical arguments. In this paper, the analysis is carried out using coupling of modes in time. A possible implementation of such a filter is a four-port system utilizing a pair of identical single-mode standing wave resonat...

When atoms move in a standing wave created by two counterpropagating laser beams, they experience a periodic potential. This potential arises because the electric field in the standing wave induces an electric dipole in the atoms, which in turn seek out the most intense regions of electric field. Atoms in optical lattice potentials can simulate a variety of condensed matter phenomena including,...

In the lecture notes on waves, we have shown that the waves on a plucked guitar string are transverse standing waves consisting of a linear superposition (i.e. sum) of harmonics of the fundamental (first harmonic) with the fundamental itself. A first-order mathematical description of the shape of the overall waveform of the transverse standing wave on a plucked guitar string is a triangle, or s...

Abstract This paper describes a standing-wave interferometer with two laser sources of different wavelengths, diametrically opposed and emitting towards each other. The resulting standing wave has an intensity profile which is moving constant velocity, directly detected inside the beam by thin transparent photo sensors. first sensor at fixed position, serving as phase reference for second one m...