To effectively utilize photon spin is crucial for developing integrated nano-circuits on a chip. However, the spin-orbit interaction of light is typically very weak at nanoscale due to the diffraction limit. While the unidirectional transmission capability can be highly enhanced on subwavelength scales with suitable architectures. Here we propose a dielectric-loaded plasmonic nanocircuit with a spin sorting coupler to directionally couple and guide plasmonic waves through two-branched waveguides. Optimized results reveal that the waveguide modes excited by circularly polarized light with different spin states can be selectively coupled to one of the two targeted branch waveguides, with a calculated unidirectional coupling efficiency as high as 0.95. In addition, a central symmetric structure is implemented, which demonstrates great potential in designing complex interconnect nanocircuits. The illustrated approach is believed to open the way for the development of monolithic plasmonic nanocircuits with flexible freedoms.
A novel dual-parameter sensor created by fusion splicing single mode fiber (SMF) and hollow core silica tube (HCST) is experimentally demonstrated for simultaneous strain and temperature measurement based on hybrid structured fiberoptic Fabry-Perot interferometer (FPI) via phase demodulation. By the phase demodulation in the spatial frequency domain, strain sensitivities of -0.002rad/με and 0.0006rad/με are respectively obtained for air-cavity and the silica-cavity with the strain range from 0με to 1000με, and the temperature sensitivities of -0.0002rad/°C and -0.01rad/°C are respectively for air-cavity and silica-cavity with the temperature range from 50°C to 450°C. Therefore, the different sensing characteristics of silica-cavity and air-cavity to strain and temperature show that this structure can be further developed to concurrently sense strain and temperature.
A single-longitudinal-mode pulsed Ho:YLF laser was demonstrated and studied experimentally at 2065.68 nm via injecting a unidirectional seed laser with double corner cubes to a Q-switched Ho:YLF power-oscillator. Up to 733-mW single-longitudinal-mode Ho:YLF laser with a structure of double corner cubes cavity is employed as seed laser with the advantages of narrow linewidth and high antimisalignment sensitivity. For single-longitudinal-mode injection-seeded Q-switched Ho:YLF laser, the output energy of 4.41 mJ is obtained with the repetitive frequency of 100 Hz, pulse width of 136 ns, and slope efficiency of 19.3%. The experimental results show that this method is a potential way to realize single-longitudinal-mode injection-seeded Q-switched Ho:YLF laser with narrow linewidth and high antimaladjustment sensitivity.
The high efficiency single-longitudinal-mode (SLM) Tm, Ho:YAP laser with ring cavity is proposed. The Tm, Ho:YAP ring laser was run on unidirectional operation using a Faraday rotator and a half-wave plate. A 0.2-mm F-P etalon was employed for wavelength tuning. SLM power could reach 231 mW with the slope efficiency of 23%, M2 factor of 1.12, and wavelength tuning range of 2053.62 to 2058.0 nm. This is the first report on the SLM Tm, Ho:YAP laser based on Faraday effect with high efficiency and tunability.
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