Sub-picosecond, strain-tunable, polarization-selective optical switching via anisotropic exciton dynamics in quasi-1D ZrSe<sub>3</sub>

Sang Ho Suk; Sanghee Nah; Muhammad Sajjad; Sung Bok Seo; Jianxiang Chen; Sangwan Sim

doi:10.1038/s41377-024-01585-0

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Sub-picosecond, strain-tunable, polarization-selective optical switching via anisotropic exciton dynamics in quasi-1D ZrSe₃

Original Articles

- Sub-picosecond, strain-tunable, polarization-selective optical switching via anisotropic exciton dynamics in quasi-1D ZrSe₃
- Light: Science & Applications Vol. 13, Issue 11, Pages: 2576-2588(2024)
- Affiliations：
  
  1.School of Electrical Engineering, Hanyang University, Ansan, South Korea
  2.Seoul Center, Korea Basic Science Institute, Seoul, South Korea
  3.Nottingham Ningbo China Beacons of Excellence Research and Innovation Institute, University of Nottingham, Ningbo, China
  4.Key Laboratory of Carbonaceous Wastes Processing and Process Intensification Research of Zhejiang Province, University of Nottingham Ningbo China, Ningbo, China
- Author bio：
  
  Sangwan Sim (swsim@hanyang.ac.kr)
- Funds：
- DOI：10.1038/s41377-024-01585-0
  CLC：
- Received：15 April 2024，
  
  Revised：29 July 2024，
  
  Accepted：2024-08-14，
  
  Published Online：06 September 2024，
  
  Published：30 November 2024
- Accepted：
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Suk, S. H. et al. Sub-picosecond, strain-tunable, polarization-selective optical switching via anisotropic exciton dynamics in quasi-1D ZrSe₃. Light: Science & Applications, 13, 2576-2588 (2024).
DOI：

Suk, S. H. et al. Sub-picosecond, strain-tunable, polarization-selective optical switching via anisotropic exciton dynamics in quasi-1D ZrSe₃. Light: Science & Applications, 13, 2576-2588 (2024). DOI： 10.1038/s41377-024-01585-0.

摘要

Abstract

In cutting-edge optical technologies

polarization is a key for

encoding and transmitting vast information

highlighting the importance of selectively switching and modulating polarized light. Recently

anisotropic two-dimensional materials have emerged for ultrafast switching of polarization-multiplexed optical signals

but face challenges with low polarization ratios and limited spectral ranges. Here

we apply strain to quasi-one-dimensional layered ZrSe

to enhance polarization selectivity and tune operational energies in ultrafast all-optical switching. Initially

transient absorption on unstrained ZrSe

reveals a sub-picosecond switching response in polarization along a specific crystal axis

attributed to shifting-recovery dynamics of an anisotropic exciton. However

its polarization selectivity is weakened by a slow non-excitonic response in the perpendicular polarization. To overcome this limitation

we apply strain to ZrSe

by bending its flexible substrate. The compressive strain spectrally decouples the excitonic and non-excitonic components

doubling the polarization selectivity of the sub-picosecond switching and tripling it compared to that in the tensile-strained ZrSe

. It also effectively tunes the switching energy at a shift rate of ~93 meV %

-1

. This strain-tunable switching is repeatable

reversible

and robustly maintains the sub-picosecond operation. First-principles calculations reveal that the strain control is enabled by momentum- and band-dependent modulations of the electronic band structure

causing opposite shifts in the excitonic and non-excitonic transitions. Our findings offer a novel approach for high-performance

wavelength-tunable

polarization-selective ultrafast optical switching.

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Keywords

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Sub-picosecond, strain-tunable, polarization-selective optical switching via anisotropic exciton dynamics in quasi-1D ZrSe3

DOI：10.1038/s41377-024-01585-0

摘要

Abstract

关键词

Keywords

references

Sub-picosecond, strain-tunable, polarization-selective optical switching via anisotropic exciton dynamics in quasi-1D ZrSe₃