Unraveling the Nature of Lasing Emission from Hybrid Silicon Nitride and Colloidal Nanocrystal Photonic Crystals with Low Refractive Index Contrast DOI
Ivo Tanghe, Tom Vandekerckhove, Margarita Samoli

et al.

ACS Photonics, Journal Year: 2024, Volume and Issue: 11(11), P. 4906 - 4915

Published: Nov. 1, 2024

Silicon nitride is used for its low optical loss and high thermal stability, making it a suitable platform visible-light applications in integrated photonic devices. However, application has been limited due to inefficient light emission, problem addressed by integrating various types of emitters onto the platform. In particular, integration solution-processable colloidal nanocrystals (NCs) as gain materials silicon promising route but requires more solid theoretical footing. By leveraging 2D surface-emitting crystal structures combined with NCs, we effectively confine manipulate achieve lasing from green red. Building on this, model light–matter interactions index contrast NC/nitride platform, validated extensive experimental validations through Fourier imaging techniques, revealing full band structure showing clear mode congestion. These comprehensive studies confirm potential hybrid NC-based fully on-chip laser indicate routes further improvement.

Language: Английский

Colloidal semiconductor quantum shells for solution-processed laser applications DOI

Divesh Nazar,

A.B. Waters,

Maxwell Marshal Kannen

et al.

Nanoscale, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

Laser diodes based on solution-processed semiconductor quantum dots (QDs) present an economical and color-tunable alternative to traditional epitaxial lasers.

Language: Английский

Citations

1
On the Determination of the Carrier Temperature in Weakly Confined Semiconductor Nanocrystals Using Time-Resolved Optical Spectroscopy DOI
Ivo Tanghe,

Chao-Yang Lin,

Isabella Wagner

et al.

Nanoscale, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

Many applications of nanocrystals rely on their use in light detection and emission. In recent years, with more relaxed carrier confinement, including so-called 'bulk' 2D implementations, have made stake. such systems, the charge carriers generated after (photo-)excitation are spread over a semi-continuous density states, behaviour controlled by temperature T. Current established methods to measure this dynamically changing include transient absorption luminescence spectroscopy, yet they very often fail agree exact leading contradicting reports. Here, we show through combined side-by-side experimental theoretical study state-of-art II-VI perovskite under weak confinement that only PL can yield unambiguously correct particular, temperatures extracted from TA heavily affected effective masses electron hole bands involved overestimations. Our results pave way robust extraction will help consolidate ensuing structure-property relations derived it.

Language: Английский

Citations

0
Stimulated Emission and Lasing from Bulk CdSe Nanocrystals DOI
Servet Ataberk Cayan, Margarita Samoli, Ivo Tanghe

et al.

The Journal of Physical Chemistry Letters, Journal Year: 2024, Volume and Issue: unknown, P. 9836 - 9843

Published: Sept. 19, 2024

Nanocrystals with a size in the regime of vanishing quantum confinement, or bulk nanocrystals (BNCs), have emerged recently as viable solution processable optical gain materials green part spectrum. Here, we show that these properties can be extended to crucial red region using CdSe BNCs. Through quantitative time-resolved spectroscopy, model semiconductors, thereby revealing originates from an unbound electron-hole plasma state. The is broadband nature and not capped by Auger processes, but slower second-order recombination resulting nanosecond lifetimes. Finally, optically pumped lasers under femtosecond pulsed quasi-continuous wave operation are demonstrated photonic crystal surface emitting laser cavity, stretching 635 720 nm. Our results indicate compositional variation indeed provide spectral versatility BNC concept, while preserving excellent metrics associated it.

Language: Английский

Citations

1
Extended Short‐Wave Infrared Colloidal Quantum Dot Lasers with Nanosecond Excitation DOI
Guy L. Whitworth, Carmelita Rodà, Mariona Dalmases

et al.

Advanced Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 6, 2024

Abstract Solution‐processed gain media have great technological potential as lasers due to their ease of integration with on‐chip photonics, scalability and tuneable optoelectronic properties. Currently, the spectral coverage solution‐processed extends from visible up telecom wavelengths in short‐wave infrared (SWIR) (<1650 nm). Here, optical extended SWIR 1600 nm 2500 is demonstrated, using PbSbased colloidal quantum dots (CQDs). This region has many applications such LIDAR, biological imaging environmental monitoring currently served by exotic, costly materials limitedscalability. Using CQDs distributed feedback laser cavities, lasing emission tuned between 2150 reported. We show that increased absorption cross‐section larger CQDs, threshold reduced a factor 36 compared smaller‐sized reaching an amplified spontaneous (ASE) down 42 µJ cm −2 . Furthermore, under nanosecond excitation are demonstrated for first time PbS use transient spectroscopy data model thresholds. paves way realizing compact practical CQD potentially toward electrically driven diodes.

Language: Английский

Citations

1
Unraveling the Nature of Lasing Emission from Hybrid Silicon Nitride and Colloidal Nanocrystal Photonic Crystals with Low Refractive Index Contrast DOI
Ivo Tanghe, Tom Vandekerckhove, Margarita Samoli

et al.

ACS Photonics, Journal Year: 2024, Volume and Issue: 11(11), P. 4906 - 4915

Published: Nov. 1, 2024

Silicon nitride is used for its low optical loss and high thermal stability, making it a suitable platform visible-light applications in integrated photonic devices. However, application has been limited due to inefficient light emission, problem addressed by integrating various types of emitters onto the platform. In particular, integration solution-processable colloidal nanocrystals (NCs) as gain materials silicon promising route but requires more solid theoretical footing. By leveraging 2D surface-emitting crystal structures combined with NCs, we effectively confine manipulate achieve lasing from green red. Building on this, model light–matter interactions index contrast NC/nitride platform, validated extensive experimental validations through Fourier imaging techniques, revealing full band structure showing clear mode congestion. These comprehensive studies confirm potential hybrid NC-based fully on-chip laser indicate routes further improvement.

Language: Английский

Citations

0