A ground-breaking study showcases a significant advancement in laser technology, promising more affordable and scalable solutions for applications ranging from environmental monitoring to biomedical imaging.
A ground-breaking study showcases a significant advancement in laser technology, promising more affordable and scalable solutions for applications ranging from environmental monitoring to biomedical imaging.
Researchers have developed the first colloidal quantum dot -based laser capable of operating across the entire extended short-wave infrared spectrum. Current laser technologies for the extended SWIR spectral range rely on expensive and complex materials, limiting their scalability and affordability. To address these challenges, ICFO researchers Dr. Guy L. Withworth, Dr. Carmelita Roda, Dr. Mariona Dalmases, Dr. Nima Taghipour, Miguel Dosil, Dr. Katerina Nikolaidou, Hamed Dehghanpour, led by ICREA Prof. Gerasimos Konstantatos, have presented a novel approach based on colloidal quantum dots in anarticle. The team managed to emit coherent light in the extended SWIR range with large colloidal quantum dots made of lead sulfide . This new CQD-based technology offers a solution to the aforementioned challenges while maintaining compatibility with silicon CMOS platforms for on-chip integration. Their PbS colloidal quantum dots are the first semiconductor lasing material to cover such a broad wavelength range. Remarkably, the researchers accomplished this without altering the dots' chemical composition. These results pave the way towards the realization of more practical and compact colloidal quantum dots lasers. Further to that, the team demonstrated lasing -- for the first time in PbS quantum dots- with nanosecond excitation, replacing the need for bulky and costly femtosecond laser amplifiers. That was achieved by employing larger quantum dots, increasing thus the absorption cross-section of the dots tenfold, leading to a dramatic reduction in the optical gain threshold -the point at which the laser light emission becomes an efficient process. The ability to produce low-cost, scalable infrared lasers in the extended SWIR range addresses critical bottlenecks in various technologies. This innovation has transformative potential for diverse applications, including hazardous gas detection, eye-safe LIDAR systems, advanced photonic integrated circuits, and imaging within the SWIR biological window. Industries relying on LIDAR systems, gas sensing, and biomedicine could greatly benefit from this cost-effective and integrable solution. Moreover, this breakthrough supports the transition to silicon-compatible photonic integrated circuits, enabling greater miniaturization and widespread adoption. "Our work represents a paradigm shift in infrared laser technology," said ICREA Prof. Gerasimos Konstantatos."For the first time, we've achieved lasing in the extended SWIR range with solution-processed materials at room temperature, paving the way for practical applications and the development of more accessible technologies." Guy L. Whitworth, Carmelita Roda, Mariona Dalmases, Nima Taghipour, Miguel Dosil, Katerina Nikolaidou, Hamed Dehghanpour, Gerasimos Konstantatos.Alongside carbon dioxide, methane is a key driver of global warming. To detect and monitor the climate pollutants in the atmosphere precisely, scientists have developed an advanced laser technology. ... Researchers have fabricated a new high-performance shortwave infrared image sensor based on non-toxic colloidal quantum dots. They report on a new method for synthesizing functional ... Researchers have discovered a cost-effective way to tune the spectrum of a laser to the infrared, a band of great interest for many laser ... A technology to further accelerate the commercialization of Colloidal Quantum Dot Photovoltaic devices, which are expected to be next-generation photovoltaic devices, has been ...Scientists Create AI That 'Watches' Videos by Mimicking the Brain
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