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Broadband Optical Phase Modulation by Colloidal CdSe Quantum Wells.

Ivo Tanghe1,2,3, Justinas Butkus4,5,6, Kai Chen5,6,7

  • 1Photonics Research Group, Ghent University, Gent 9000, Belgium.

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|December 29, 2021
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Summary
This summary is machine-generated.

We measured the refractive index changes in two-dimensional (2D) semiconductors, revealing ultrafast and broadband optical phase modulation crucial for photonic devices. This work quanties phase changes in 2D colloidal quantum wells.

Keywords:
2D materialsnanocrystalsoptical phasespectroscopy

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Area of Science:

  • Materials Science
  • Optics
  • Condensed Matter Physics

Background:

  • Two-dimensional (2D) semiconductors offer potential for photonic devices reliant on photogenerated charge dynamics.
  • Quantifying refractive index changes and optical phase modulation in these materials is essential but challenging.
  • Existing methods struggle with the dilute nature of many 2D materials.

Purpose of the Study:

  • To measure and quantify the optical phase modulation of two-dimensional (2D) colloidal cadmium selenide (CdSe) quantum wells.
  • To develop a computational method for determining the time-dependent refractive index of colloidal 2D materials.
  • To understand the impact of excitonic features and intraband transitions on phase modulation.

Main Methods:

  • Femtosecond interferometry was employed to measure optical phase modulation across a broad spectrum.
  • A modified effective medium algorithm was developed to calculate time-dependent refractive index.
  • Transient absorption experiments were utilized as input for the refractive index calculation toolbox.

Main Results:

  • Demonstrated that 2D colloidal CdSe quantum wells can effectively modulate light phase using femtosecond interferometry.
  • Developed a toolbox enabling refractive index calculation from transient absorption data for colloidal 2D materials.
  • Observed broadband, ultrafast, and significant phase modulation due to excitonic features, extending into the near-infrared via intraband transitions.

Conclusions:

  • The study quantifies ultrafast and broadband optical phase modulation in 2D semiconductors, essential for photonic device design.
  • The developed toolbox provides a pathway to calculate time-dependent refractive indices from readily available experimental data.
  • Excitonic and intraband transitions in 2D materials are key drivers of significant phase modulation across a wide spectral range.