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An Electrically Controlled Wavelength-Tunable Nanoribbon Laser.

Xin Yang¹, Zhengping Shan², Ziyu Luo¹

¹Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Materials Science and Engineering, Hunan University, Changsha 410082, Hunan, People's Republic of China.

|February 14, 2020

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Researchers developed an electrically tunable laser using cadmium sulfide (CdS) nanoribbons. This device offers continuous wavelength tuning and dynamic switching, advancing nanophotonic applications.

Area of Science:

Optoelectronics
Nanophotonics
Materials Science

Background:

Nanoscale laser sources are crucial for applications like on-chip interconnects and optical communication.
Achieving tunable laser output is vital for wavelength-division multiplexing and controlled light-matter interactions.

Purpose of the Study:

To demonstrate an electrically controlled, wavelength-tunable laser using a cadmium sulfide (CdS) nanoribbon (NR).
To investigate the mechanisms behind wavelength tuning and dynamic switching in the CdS NR laser.

Main Methods:

Fabrication and characterization of CdS nanoribbon (NR) laser devices.
Electrical biasing to induce wavelength tuning and dynamic switching.
Bias-dependent absorption and time-resolved photoluminescence (PL) measurements.

Keywords:

cadmium sulfide electrical control individual nanoribbon nanolaser wavelength-tunable

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Main Results:

Demonstrated continuous lasing wavelength tuning from 510 to 520 nm with applied bias (0-15.4 kV/cm).
Observed typical "S"-shaped pump power dependence and line width narrowing.
Confirmed current-induced thermal band gap reduction as the primary tuning mechanism, alongside the Franz-Keldysh effect.
Achieved dynamic switching of nanoribbon lasing with a modulation ratio up to ~21 dB.

Conclusions:

The electrically tuned, wavelength-reversible CdS NR laser is a significant advancement for chip-based nanophotonics.
This technology enables color-selective coherent emitters for future optoelectronic circuitry.