Author Affiliations
1Key Laboratory of Optical Fiber Sensing & Communications (Education Ministry of China), University of Electronic Science & Technology of China, Chengdu 611731, China2Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, DK-2100 Copenhagen, Denmark3College of Physics, Optoelectronics and Energy & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, Chinashow less
Fig. 1. Sketch of the proposed structure. (a) Cold cavity. (b) Cavity with gain. (c) Emission spectrum of the dipole source. (d) Real part of refractive index of the gain region. (e) Imaginary part of refractive index of the gain region.
Fig. 2. Output spectrum and integrated intensity of the laser from cold cavity analysis. In (a) and (b), the density of scatters is 2.3 and 73.1 μm−3, respectively. (c) Average intensity received by an inner and outer monitor versus density of scatters.
Fig. 3. Intensity distribution for different resonance modes from cold cavity analysis; (a)–(d) correspond to mode resonance wavelength of 0.537, 0.562, 0.571, and 0.615 μm, respectively, as M1–M4 marked in Fig. 2(a).
Fig. 4. Lasing spectra from four different monitoring positions; (a)–(d) correspond to the monitor position of C1–C4, respectively. Taking center of the core as origin of coordinate, positions of C1–C4 are (0 μm, 6 μm), (6 μm, 0 μm), (0 μm, 6 μm), and (−6 μm, 0 μm), respectively. The thick/thin curves correspond to the case of with/without the consideration of gain. For clarity, intensity of the thin curves is enlarged 20 times.
Fig. 5. Output of the laser with an inserted nanoparticle. (a), (c), and (e) are the spectra; (b), (d), and (f) are the intensity distribution for the nanoparticle sited at positions (0 μm, 5 μm), (5 μm, 0 μm), and (2.5 μm, 2.5 μm); (g)/(h) is the mapping of peak intensity/wavelength of output when position of the inserted nanoparticle varies.