Nodeless antiresonant hollow core fiber for low loss flatband THz guidance

Abstract

This paper reveals a THz leading nodeless antiresonant slotted hollow core fiber (NARS-HCF) with low transmission loss and broad band flat near zero dispersion. We have achieved better results in a simpler structure as far as we know: a minimal confinement loss in the order of around 10−4 dBm-1 and a very low effective material loss of 0.0248 dBm-1, resulting in a lowest total transmission loss of 0.0254 dBm-1 at 1.27 THz and offering a 0.88 THz (0.8 THz – 1.68 THz) low loss transmission bandwidth with the loss of less than 0.0811 dBm-1. Additionally, we achieved a 0.0614 ± 0.0468 ps/THz/cm near zero flat dispersion over the widest bandwidth of 1.02 THz (0.80 THz to 1.82 THz). Moreover, our proposed structure can also effectively perform as single mode fiber with excellent bending loss performance, hence, can be useful for efficient THz transmission systems.

Nested multibar cladding elements in negative curvature fibers for CO laser guidance

“…The spectral region centered at 5.4 μm is important for the CO laser, an alternative light source in the mid-IR region for material processing and spectroscopy [17]. Various NCF structures such as tubular [11], elliptical [18,19,34], lotus-shaped [35], conjoined-tube [36], double-ring [37], adjacent nested [38], nested compounded [39], double nested [40,41], and bar supported NCFs [41][42][43][44] have been reported to improve the transmission losses of hollow-core structures. Although several studies on bar-supported structures have been reported, they are mainly focused on light guidance in either the near-IR or terahertz (THz) regions.…”