Lifeboat Foundation

Similar to optical vortex beams, terahertz (THz) vortex beams (TVBs) also carry orbital angular momentum (OAM). However, little research has been reported on the generation of TVBs. In this paper, based on the detour phase technique, we design a series of spintronic terahertz emitters with a helical Fresnel zone plate (STE-HFZP) to directly generate focused TVBs with topological charges (TCs) of l = ±1, ±2 and ±3, respectively. The STE-HFZP is a hybrid THz device composed of a terahertz emitter and a THz lens, and it has a high numerical aperture (NA), achieving subwavelength focal spots. Its focus properties are surveyed systemically through accurate simulations. This STE-HFZP can also generate focused TVBs with higher order TCs.

Double-sided microlens arrays (DSMLAs) play a crucial role in improving the performance of optical devices, supporting applications from advanced imaging systems to laser beam homogenization. However, traditional manufacturing methods often struggle with alignment errors that diminish the functionality and efficiency of these arrays.

AiM’s MRI robot successful in trial:

A recent cadaver trial demonstrated the success of AiM’s MRI-guided robot in deep brain stimulation, marking a milestone in neurosurgery.

Continue reading “In a first, MRI-compatible surgical robot enters human clinical trials” »

Microballistic impact testing at strain rates greater than 106 s−1 shows that pure metals, including copper, gold and titanium, become stronger with increasing temperature.

DARPA has showcased six innovative design concepts for its AdvaNced airCraft Infrastructure-Less Launch And RecoverY (ANCILLARY) program, aimed at enhancing the capabilities of small vertical take-off and landing (VTOL) uncrewed aerial systems (UAS).

Awodey, Steve, Álvaro Pelayo, Michael A. Warren (2013). Voevodsky’s Univalence Axiom in homotopy type theory. Notices of the American Mathematical Society.

Bakhtin, Mikhail (1984). Bakhtin’s analysis of Dostoevsky. Problems of Dostoevsky’s Poetics. U. Minn. Press.

Carpenter, James (2012). First Sight: ESP and Parapsychology in Everyday Life. Rowan & Littlefield.

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