Three-level spaser for next-generation luminescent nanoprobe
| Autor: | Hai-Jie Lu, Bin Kang, Miao Zhang, Jian-Hua Wang, Fan Yang, Hong-Yuan Chen, Pei Song, Jing-Juan Xu |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Active laser medium
Materials science 02 engineering and technology 01 natural sciences law.invention Laser linewidth law 0103 physical sciences Spaser 010306 general physics Plasmon Research Articles Multidisciplinary Chemical Physics business.industry Surface plasmon SciAdv r-articles Optics 021001 nanoscience & nanotechnology Laser Picosecond Optoelectronics 0210 nano-technology business Lasing threshold Research Article |
| Zdroj: | Science Advances |
| ISSN: | 2375-2548 |
| Popis: | Delayed spasing dots with ~3-nm spectral width, ~1 mJ cm−2 threshold, and ~102-μs lifetime were developed for a bionanoprobe. The development of modern biological and medical science highly depends on advanced luminescent probes. Current probes typically have wide emission spectra of 30 to 100 nm, which limits the number of resolvable colors that are simultaneously labeled on samples. Spasers, the abbreviation for surface plasmon lasers, have ultranarrow lasing spectra by stimulated light amplification in the plasmon nanocavity. However, high threshold (>102 mJ cm−2) and short lasing lifetime (approximately picoseconds to nanoseconds) still remain obstacles for current two-level spaser systems. We demonstrated a new type of a three-level spaser using triplet-state electrons. By prolonging the upper state lifetime and controlling the energy transfer, high gain compensation was generated. This probe, named delayed spasing dots (dsDs), about 50 to 60 nm in size, exhibited a spectral linewidth of ~3 nm, an ultralow threshold of ~1 mJ cm−2, and a delayed lasing lifetime of ~102 μs. As the first experimental realization of the three-level spaser system, our results suggested a general strategy to tune the spasing threshold and dynamics by engineering the energy level of the gain medium and the energy transfer process. These dsDs have the potential to become new-generation luminescent probes for super-multiplex biological analysis without disturbance from short lifetime background emission. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|