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Express"],"published-print":{"date-parts":[[2020,6,8]]},"abstract":"<jats:p>We report the method of producing a spatio-temporal (ST) wave packet carrying pure transverse orbital angular momentum (OAM) with subwavelength spatial sizes. Due to the lack of temporal focusing, an ST wave packet focused by a high numerical aperture (NA) objective lens experiences a \u201cspatio-temporal astigmatism\u201d effect similar to the focusing action of a cylindrical lens on the transverse profile of optical field. Thus an ST vortex with a spiral phase in the ST domain focused through a high NA objective will be distorted and lose the ST characteristic spiral phase pattern. With the understanding of such an ST astigmatism, the ST wave packet can be pre-conditioned such that an ST vortex carrying OAM with subwavelength transverse sizes can be obtained after strong focusing. This is the first revelation that a tightly focused ST vortex beam with transverse OAM can be realized, paving the way for potential applications including microscopy, optical trapping, laser machining, nonlinear light-matter interactions, and so on. The ST astigmatism effect also offers insights for the focusing and propagation studies of other types of ST wave packets.<\/jats:p>","DOI":"10.1364\/oe.394428","type":"journal-article","created":{"date-parts":[[2020,5,30]],"date-time":"2020-05-30T18:30:05Z","timestamp":1590863405000},"page":"18472","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":45,"title":["Subwavelength focusing of a spatio-temporal wave packet with transverse orbital angular momentum"],"prefix":"10.1364","volume":"28","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6770-7383","authenticated-orcid":true,"given":"Jian","family":"Chen","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chenhao","family":"Wan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andy","family":"Chong","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8745-4213","authenticated-orcid":true,"given":"Qiwen","family":"Zhan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"285","published-online":{"date-parts":[[2020,6,5]]},"reference":[{"key":"oe-28-12-18472-R1","doi-asserted-by":"publisher","first-page":"8185","DOI":"10.1103\/PhysRevA.45.8185","volume":"45","author":"Allen","year":"1992","journal-title":"Phys. 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