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Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons

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Intense second-harmonic generation in two-dimensional PtSe₂.

Lingrui Chu¹, Ziqi Li², Han Zhu¹

¹School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China.

Nanophotonics (Berlin, Germany)

|December 5, 2024

Summary

This summary is machine-generated.

Platinum diselenide (PtSe2) exhibits strong layer-dependent second-harmonic generation, making few-layer PtSe2 a promising material for nonlinear nanophotonics due to its exceptional optical response and air stability.

Keywords:

nonlinear optics platinum diselenide (PtSe2)second-harmonic generation

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Area of Science:

Materials Science
Condensed Matter Physics
Nanophotonics

Background:

Platinum diselenide (PtSe2) is a noble metal dichalcogenide with layer-dependent electronic properties.
Its high charge-carrier mobility and air stability are attractive for electronic and optoelectronic devices.
Two-dimensional (2D) PtSe2 shows potential as a saturable absorber due to broad spectral nonlinear optical response.

Purpose of the Study:

To investigate the second-order nonlinear optical characteristics of 2D PtSe2.
To analyze the second-harmonic generation (SHG) properties of PtSe2.
To explore the potential of PtSe2 in ultrafast and nonlinear photonics.

Main Methods:

Utilized a pulsed laser at 1064 nm to excite second-harmonic generation (SHG) in 2D PtSe2.
Analyzed the layer-dependent SHG intensity and polarization dependence.
Compared the SHG response of PtSe2 with molybdenum disulfide (MoS2).

Main Results:

Observed a distinct layer-dependent SHG response in PtSe2, with strongest intensity in few-layer samples.
The SHG intensity exhibited a six-fold polarization dependence, consistent with the crystal's threefold rotational symmetry.
Four-layer PtSe2 showed an SHG intensity approximately 60-fold greater than monolayer MoS2.

Conclusions:

Few-layer PtSe2 possesses a strong second-order nonlinear optical response.
The material's high air stability and significant nonlinear optical properties make it suitable for ultrathin nonlinear nanophotonic devices.
PtSe2 presents exciting opportunities for advancements in ultrafast and nonlinear photonics.