Abstract
We propose a potentially practical scheme for realizing ultrasensitive size sensor of a single metallic nanoparticles (MNP) in a hybrid nonlinear microcavity. This is achieved by exploiting a well-established microcavity-engineered plasmonic resonance, where a degenerate parametric amplifier (DPA) is embedded into the microcavity driven by a strong pump field and a weak probe pulse. It is shown that the transmission spectrum of the probe pulse exihibits a two-peak splitting and the splitting width depends on the radius. The radius of a single MNP can be inferred from the transmission spectrum by monitoring the width between two peaks. Using experimentally achievable parameters, we identify the detection sensitivity of the sensor can reach approximately 0.198 THz/nm for detecting and sizing of individual MNPs as small as 10 nm in radius.
Highlights
Considerable attention has been paid to detecting and sizing individual nanoparticles with high resolution due to the wide applications including environmental monitoring, disease diagnosis, precision industrial manufacturing, and so on [1], [2]
We demonstrate that the degenerate parametric amplifier (DPA) assisted microcavity-engineered plasmonic resonance interacting with a quantum emitter deserves to be realize the all-optical sizing sensor of a single nanoparticle
The quantum emitter is assembled onto the metallic nanoparticles (MNP) surface, and the composite is placed inside an optical microcavity assisted by DPA
Summary
Considerable attention has been paid to detecting and sizing individual nanoparticles with high resolution due to the wide applications including environmental monitoring, disease diagnosis, precision industrial manufacturing, and so on [1], [2]. While the optical microcavity with the high-quality factors and microscale mode volume enable strong light-matter interaction that can be used for ultrasensitive optical detection [7]. In this regard, we note that detecting and sensing for single nanoparticles by monitoring the nanoparticle-dependent transmission spectra of high-quality microcavity has been reported [8]–[20]. We demonstrate detection sensitivity of the sensor can reach approximately 0.198 THz/nm for detecting and sizing of individual MNPs as small as 10 nm in radius using DPA induced spectral splitting even with low quality factor of the optical microcavity. With the help of DPA, we find that the noise squeezing spectrum is lower than the standard quantum limit
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