New Strategy to Enhance Single Photon Emitters for Quantum Photonics

In an article published recently in the journal Nano Letters, a hybridized plasmon probe made of a fiber taper and silver nanowire (Ag NW) was utilized to selectively alter the radiation characteristics of single photon emitters (SPEs) with variably aligned polarization.

New Strategy to Enhance Single Photon Emitters for Quantum Photonics

Study: Near-Field Modulation of Differently Oriented Single Photon Emitters with A Plasmonic Probe. Image Credit: wacomka/

The Significance of Single Photon Emitters

Single photon emitters (SPEs) have been the focus of extensive research for decades, with the goal of creating bright and pure sources as the foundation of expandable quantum nanoscale photonic systems. Solid-phase SPEs play a critical role in quantum computers, quantum simulations, quantum encrypted networking, quantum walks, and highly precise estimations.

Several solid-state SPEs, like quantum dots (QDs), nitrogen-vacancy (NV) color centers in diamond, and point defects in thin sheets of semiconductive transition-metal dichalcogenides (TMDs), have been produced.

Manipulation of SPEs is critical for emerging quantum data processing, and several ways have been suggested. A recent study, for example, revealed improved emissions via emitters coupled with microscale cavities; another employed a resonance nanoscale antenna to reduce the lifespan of hexagon boron nitride SPEs, while another used spherical gold nanoparticles in immediate proximity to quantum emissions to produce light improvement.

Modulation of Light with Plasmon Structures

Control of SPE irradiation is challenging due to an imbalance in between efficient modal sizes of the SPE's fixed dipole moment and traditional photonic technologies, even with microscale or nanoscale optical instruments like dielectric waveguides. A much reduced modal size on the subwavelength level is necessary to boost the pairing intensity among the SPEs and photons.

Surface plasmon polaritons (SPPs) considerably boost the pairing by restricting the optical mode to nanometric range, resulting in increased SPE output. Generally, though, it stays within the weaker coupling range due to SPP degradation.

SPP-photon pairing has emerged as a significant area of study for tip improvement, optical gadget manufacturing, sensing, and other applications. Furthermore, it is well established that the intensity of the pairing is largely dependent on the overlapping of the electrical field vectors among emitters and SPP mode. This means that the linkage is highly responsive to photon polarization, which is an essential characteristic that may be used to encrypt quantum data.

Several investigations have been conducted on the polarization-reliant regulation of luminescence using plasmon devices. A previous study, for instance, discovered that the polarization of the activation laser and the orientation of Ag NWs were connected to the light amplification of CdSe nanostructures.

Unfortunately, there is a lack of research in the literature on the polarization dependency of the linkage among SPPs and SPEs. The effort in this study is focused on investigating the substantial polarization-reliance of consistent modulation for SPEs in greater depth.

Important Findings of the Study

In this study, the team used a plasmon probe incorporated with a hanging Ag NW clinging to a fiber taper to locally adjust the lifespan of SPEs with various configurations in the near field region.

When the probe was inserted into the SPE's near field region, the emission speed of the activated phase in the SPE may be controlled effectively, as shown by variations in lifespan. This variation is substantially influenced by the polarized alignment of the SPEs.

The emission lifespan of dipoles having out-of-plane polarization elements, like CdSe quantum dots, was considerably reduced while the PL was increased by changing the plasmon probe. As a result of shifting the probe horizontally, it may be possible to actively increase or decrease the lifespan of in-plane configurations such as hBN defect SPEs.

The scientists also detailed the physical process of lifespan modifications using computational simulations and hypotheses, which might give a unique perspective into the creation of nanoscale photonic systems and embedded circuits.

The practical findings also support previous computational simulations and conceptual analyses. This research also opens up exciting possibilities for new quantum photonic sources. Brighter SPEs, for instance, could be generated at ambient temperatures using this technology, and the optical properties of a specific SPE with nanoscale dimensions may be modified locally.


Liu, X.-J., Wu, Y.-K. et al. (2022). Near-Field Modulation of Differently Oriented Single Photon Emitters with A Plasmonic Probe. Nano Letters. Available at:

Disclaimer: The views expressed here are those of the author expressed in their private capacity and do not necessarily represent the views of Limited T/A AZoNetwork the owner and operator of this website. This disclaimer forms part of the Terms and conditions of use of this website.

Shaheer Rehan

Written by

Shaheer Rehan

Shaheer is a graduate of Aerospace Engineering from the Institute of Space Technology, Islamabad. He has carried out research on a wide range of subjects including Aerospace Instruments and Sensors, Computational Dynamics, Aerospace Structures and Materials, Optimization Techniques, Robotics, and Clean Energy. He has been working as a freelance consultant in Aerospace Engineering for the past year. Technical Writing has always been a strong suit of Shaheer's. He has excelled at whatever he has attempted, from winning accolades on the international stage in match competitions to winning local writing competitions. Shaheer loves cars. From following Formula 1 and reading up on automotive journalism to racing in go-karts himself, his life revolves around cars. He is passionate about his sports and makes sure to always spare time for them. Squash, football, cricket, tennis, and racing are the hobbies he loves to spend his time in.


Please use one of the following formats to cite this article in your essay, paper or report:

  • APA

    Rehan, Shaheer. (2022, March 15). New Strategy to Enhance Single Photon Emitters for Quantum Photonics. AZoNano. Retrieved on May 23, 2022 from

  • MLA

    Rehan, Shaheer. "New Strategy to Enhance Single Photon Emitters for Quantum Photonics". AZoNano. 23 May 2022. <>.

  • Chicago

    Rehan, Shaheer. "New Strategy to Enhance Single Photon Emitters for Quantum Photonics". AZoNano. (accessed May 23, 2022).

  • Harvard

    Rehan, Shaheer. 2022. New Strategy to Enhance Single Photon Emitters for Quantum Photonics. AZoNano, viewed 23 May 2022,

Tell Us What You Think

Do you have a review, update or anything you would like to add to this news story?

Leave your feedback
Your comment type