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We demonstrate enhanced terahertz wave transmission through carbon nanotube films with subwavelength apertures. The peak frequency of the transmitted waves matches well with the shape resonance, mainly determined by the length of the apertures and the refractive index of surrounding media.
We performed time-domain terahertz (THz) spectroscopy on single-walled carbon nanotube films. We found that a filtration method provides an efficient way of fabricating thick nanotube films which is capable of effective shielding of THz waves. Shielding effectiveness of more than 40 has been achieved from our method. In addition, all of the films we fabricated demonstrate a good metallic behavior...
A low-energy femtosecond laser micromachining system, which is effectively applied to fabricate micro-structured carbon nanotube field emitter arrays with different tip sizes and shapes, is presented. Superior emission characteristics are obtained with the patterned structures.
We propose a novel in-line saturable absorber by employing a carbon nanotube-filled hollow optical fiber. Robust and efficient all-fiber ultrafast lasers are realized based on this scheme, exhibiting 2.5-nm 3-dB spectral bandwidth at 18.5 MHz.
We performed time-domain terahertz spectroscopy on flexible films coated by single-walled carbon nanotube. The films demonstrate good shielding of electromagnetic waves in the terahertz range, maintaining good transparency for visible light. The shielding efficiency can be engineered by the thickness control of the film and by the chemical treatments.
Single-walled carbon nanotube saturable absorbers were designed for passive mode-locking near 1 mum. Using Yb:KYW and Yb:KLuW, nearly transform-limited sub-150 fs pulses were generated at 1037 nm and 1048 nm, respectively.
Ultrafast single-walled carbon nanotube saturable absorbers were fabricated and optimized for mode-locking solid-state lasers near 1 mum. Their typical modulation depth and recovery time were measured to be Gt 0.3% and ~ 750 fs, respectively.
We present low-power, femtosecond laser machining on vertically aligned array of carbon nanotube (CNT) films synthesized by two different growth techniques. Arrays of holes can be efficiently fabricated for a possible application as CNT based metamaterials, showing completely different features for the two samples.
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