Publications by authors named "Cun-Jun Ruan"
Polarization converters play an important role in modern communication systems, but their wide and multiple band operation to facilitate volume and size reduction is quite challenging. In this paper, a triple-band Linear Polarization to Circular Polarization (LP-to-CP) converter is presented using a novel design procedure based on geometric parameters optimization of a metasheet. The proposed converter is ultrathin, wideband, stable over a wide range of incident angles, and polarization diverse.
View Article and Find Full Text PDFWe systematically investigate the data analysis methods in terahertz frequency domain spectroscopy (THz-FDS) with coherent detection. We demonstrate that the Hilbert transform method is one of the most appropriate for data processing in THz-FDS. By converting frequency-domain signal into time domain with further data processing, the system noise due to Fabry-Pérot (FP) interference is greatly restrained.
View Article and Find Full Text PDFArticle Synopsis
- Researchers generated terahertz (THz) pulses with an energy of 0.2 mJ using lithium niobate and Ti:sapphire laser pulses at room temperature.
- They improved the efficiency of converting 800 nm laser light to THz waves to 0.3% by adjusting the laser's pulse characteristics to minimize multi-photon absorption.
- This method suggests a potential for generating even larger THz pulses using current Ti:sapphire laser systems capable of producing Joule-level energy in very short pulses.