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Enhanced chirality of TDBC based on gap modes of surface plasmons in metal-air hole array structure

  • Regular Article – Optical Phenomena and Photonics
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The European Physical Journal D Aims and scope Submit manuscript

Abstract

We propose a structure to enhance the chirality of chiral molecular J-aggregates (TDBCs) by surface plasmons. TDBC layer is sandwiched between an air hole array in a silver film and a silver substrate. Finite difference time domain method is used to simulate our proposed structures. The results show that the chirality of our proposed structure is as 240 times as the one of only TDBCs. Air hole forms a low-quality-factor Fabry–Perot (FP) cavity, and these FP cavities enhance the electric field. With the help of FP cavities, the coupling between electric fields and TDBCs is enhanced, and the chirality is amplified. By tuning the parameters of the structure, there is a suit of parameters to make the maximum value of the circular dichroism (CD) spectrum the largest. This shows the competition between the dissipation induced by FP cavities and the coupling between FP cavities and TDBCs. This competition also presents in the changing the thickness of TDBCs. There is an optimal thickness of TDBCs to make the maximum value largest. Our structure can enhance the chirality of TDBCs in a large wavelength range of visible light, providing a new and possible way to enhance the chirality of TDBCs.

Graphic Abstract

We calculate an air hole array in a silver film and a silver substrate structure to enhance the chirality of chiral molecules (TDBCs). The results show that the chirality of our proposed structure is as 240 times as the one of only TDBCs.

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Data Availability Statement

This manuscript has no associated data or the data will not be deposited. [Authors’ comment: This manuscript has no associated data with other works in Eur. Phys. J. D. The data in the manuscript comes from our calculations.]

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Acknowledgements

We thank the efforts of all editors and referees to our manuscript.

Funding

This work was supported by the Ministry of Science and Technology of China (NO. 2021YFF0600403).

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Authors and Affiliations

  1. School of Electronic Engineering, Beijing University of Posts and Telecommunications, No. 10 Xitucheng Road, Beijing, 100876, China

    Zelai Yu

  2. School of Science, Beijing University of Posts and Telecommunications, No. 10 Xitucheng Road, Beijing, 100876, China

    Qihui Ye & Gang Song

  3. International School, Beijing University of Posts and Telecommunications, No. 10 Xitucheng Road, Beijing, 100876, China

    Qihui Ye

Authors
  1. Zelai Yu
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  2. Qihui Ye
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  3. Gang Song
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Contributions

GS provides the idea. ZY and QY do the simulations.

Corresponding author

Correspondence to Gang Song.

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The authors declared that they have no conflicts of interest to this work. We declare that we do not have any commercial or associative interest that represents a conflict of interest in connection with the work submitted

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Yu, Z., Ye, Q. & Song, G. Enhanced chirality of TDBC based on gap modes of surface plasmons in metal-air hole array structure. Eur. Phys. J. D 76, 132 (2022). https://doi.org/10.1140/epjd/s10053-022-00447-x

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  • DOI: https://doi.org/10.1140/epjd/s10053-022-00447-x

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