Kritika JainOkinawa Institute of Science and Technology | OIST · Quantum Systems Unit
Doctor of Philosophy
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Citations since 2017
7 Research Items
December 2021 - present
August 2015 - July 2021
The modified radiative and non-radiative states due to the weak coupling of an emitter with other resonant objects (Purcell effect) can be recast as a quantum interference of the paths of the photon that define the classical scattering and absorption by the object. When the coupling is stronger, additional paths representing the Rabi oscillations o...
It is known that the more tractable Markovian models of coupling suited for weak interactions may overestimate the Rabi frequency notably when applied to the strong-coupling regime. Here, a more signiﬁcant consequence of the non-Markovian interaction between a photon emitter and dissipating matter such as resonant plasmonic nanoparticles is describ...
It is known that the more tractable Markovian models of coupling suited for weak interactions may overestimate the Rabi frequency significantly, and alter the total decay rate marginally, when applied to the strong-coupling regime. Here we describe a more significant consequence of the non-Markovian interaction between a photon emitter and dissipat...
The modified density of optical states due to a weak coupling with external cavities or other resonant matter (Purcell effect), can also be recast as the effect of coherent superposition of the classical paths of the photon. When the coupling is stronger, the quantum interference of additional paths representing the possible re-absorption of the ph...
The Purcell effect has been the basis for several decades in understanding enhancement of photonic efficiency and decay rates of emitters through their coupling to cavity modes and metal nanostructures. However, it is not clear whether this regime of radiative enhancements can be extended to ultrasmall nanoparticle sizes or interparticle distances....
This work shows that, counterintuitively, adding extremely small (<10 nm in dimension) fully absorbing metal nanoparticles to a material can notably enhance its light emission. It also shows that the mystery behind the unexpected large enhancements in surface-enhanced Raman spectroscopy, even greater than a factor of 1010, is the tunneling out of p...