Dual-color plasmonic random lasers for speckle-free imaging.

A dual-color plasmonic random laser under single-excitation is achieved in an ultrathin membrane doped with binary quantum dots and gold nanorods. The gold nanorods tune the luminescence lifetime and emission efficiency of quantum dots. Under single excitation, low-threshold random lasing is observed.

Polymer Lasing in a Periodic-Random Compound Cavity.

Simultaneous distributed feedback (DFB) lasing and linear polarized random lasing are observed in a compound cavity, which consists of a grating cavity and a random cavity. The grating cavity is fabricated by interference lithography. A light-emitting polymer doped with silver nanoparticles is spin-coated on the grating, forming a random cavity.

Flexible Random Laser Using Silver Nanoflowers.

A random laser was achieved in a polymer membrane with silver nanoflowers on a flexible substrate. The strong confinement of the polymer waveguide and the localized field enhancement of silver nanoflowers were essential for the low-threshold random lasing action. The lasing wavelength can be tuned by bending the flexible substrate.

Effects of Cavity Structure on Tuning Properties of Polymer Lasers in a Liquid Environment.

The effect of cavity structures on the tuning properties of polymer lasers was investigated in two common distributed-feedback cavities. The configurations of the two cavities are substrate/grating/active waveguide and substrate/active waveguide/grating, respectively. The polymer lasers were operated in the liquid environment, and the laser wavelength was tuned dynamically by changing the refractive index of the liquid.

Operating Characteristics of High-Order Distributed Feedback Polymer Lasers.

In this study, high-order distributed-feedback (DFB) polymer lasers were comparatively investigated. Their performance relies on multiple lasing directions and their advantages include their high manufacturing tolerances due to the large grating periods. Nine laser cavities were fabricated by spin-coating the gain polymer films onto a grating structure, which was manufactured via interference lithography that operated at the 2, 3, and 4 DFB orders.

Hybrid lasing in a plasmonic cavity.

Distributed feedback lasing and surface plasmon lasing were achieved in a single laser device. The laser cavity consisted of a four-layer structure including two metal films, a grating, and a gain material; the cavity was fabricated by combining interference lithography and metal evaporation. A hollow structure was employed to overcome the Joule losses of the metal film.