Tuneable photonic crystal lasers and a method of fabricating the same

摘要: Room temperature lasing from optically pumped single defect in a two-dimensional photonic bandgap crystal is illustrated. The high Q optical microcavities are formed by etching an array of air holes into half wavelength thick multiquantum well waveguide. Defects the or used to support highly localized modes with volumes ranging 2 3 (λ/2n)3. Lithographic tuning hole radius and lattice spacing match cavity quantum gain peak, as increase Q. lasers were 10-30 nsec pulse 0.4-1 percent duty cycle. threshold pump power was 1500 milliwatts. confinement mode energy tiny volume enhancement spontaneous emission rate make interesting device for low threshold, coupling factor lasers, modulation light emitting diodes. Optic structures crystals also hold promise due flexibility their geometries. methods may be employed alter geometry so tune characteristics. integration densely packed waveguides, prisons, sources integrated on monolithic chip made possible. Lithographically defined cavities find use some material systems alternative epitaxially grown mirrors, such long wavelengths vertical surface (VCSEL) GaN based devices.