Fabrication and characterization of microcavity lasers in rhodamine B doped SU8 using high energy proton beam

The authors present their results on the characterization of individual dye-doped microcavity polymer lasers fabricated using a high energy proton beam. The lasers were fabricated in rhodamine B doped SU8 resist with a single exposure step followed by chemical processing. The resulting trapezoidal shaped cavities had dimensions of ∼ 250 × 250 μ m 2 . Physical characterization of these structures was performed using a scanning electron microscope while the optical characterization was carried out by recording the emission subsequent to pumping the lasers with 532 nm , 6 nanosecond pulses. The authors observed intense, narrow emission near 624 nm with the best emission linewidth full width at half maximum of ∼ 9 nm and a threshold ∼ 150 μ J ∕ mm 2 .