  This paper aims to study amplitude death in time delay coupled oscillators
using the occasional coupling scheme that implies the intermittent interaction
among the oscillators. An enhancement of amplitude death regions (i.e., an
increment of the width of the amplitude death regions along the control
parameter axis) can be possible using the occasional coupling in a pair of
delay-coupled oscillators. Our study starts with coupled limit cycle
oscillators (Stuart-Landau) and coupled chaotic oscillators (R\"ossler). We
further examine coupled horizontal Rijke tubes, a prototypical model of
thermoacoustic systems. Oscillatory states are highly detrimental to
thermoacoustic systems such as combustors. Consequently, a state of amplitude
death is always preferred. We employ the on-off coupling (i.e., a square wave
function), as an occasional coupling scheme, to these coupled oscillators. On
monotonically varying the coupling strength (as a control parameter), we
observe an enhancement of amplitude death regions using the occasional coupling
scheme compared to the continuous coupling scheme. In order to study the
contribution of the occasional coupling scheme, we perform a detailed linear
stability analysis and analytically explain this enhancement of the amplitude
death region for coupled limit cycle oscillators. We also adopt the frequency
ratio of the oscillators and the time delay between the oscillators as the
control parameters. Intriguingly, we obtain a similar enhancement of the
amplitude death regions using frequency ratio and time delay as the control
parameters in the presence of the occasional coupling. Finally, we use a
half-wave rectified sinusoidal wave function (motivated by practical reality)
to introduce the occasional coupling in time-delay coupled oscillators and get
similar results.
