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Additionally, numerical simulations of beam propagation characteristics reveal that the system achieves sub-wavelength imaging resolution up to 1\u00a0mm from the SIL at 0.5\u00a0THz, highlighting its potential for non-destructive testing of subsurface structures. These findings gain experimental validation through imaging stacked utility knife blades with sub-wavelength structures ranging from 0.2 to 2\u00a0THz.<\/jats:p>","DOI":"10.1364\/ao.519288","type":"journal-article","created":{"date-parts":[[2024,4,11]],"date-time":"2024-04-11T15:00:08Z","timestamp":1712847608000},"page":"3619","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Spatial and spectral beam characteristics in a terahertz broadband sub-wavelength imaging system using a solid immersion lens"],"prefix":"10.1364","volume":"63","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6595-134X","authenticated-orcid":true,"given":"Da-Hye","family":"Choi","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/03ysstz10","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"285","published-online":{"date-parts":[[2024,4,25]]},"reference":[{"key":"ao-63-13-3619-R1","doi-asserted-by":"publisher","first-page":"043001","DOI":"10.1088\/1361-6463\/50\/4\/043001","volume":"50","author":"Dhillon","year":"2017","journal-title":"J. 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