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Doubling the far-field resolution in midinfrared microscopy
Kumbham, Mahendar; Daly, Susan; O'Dwyer, Kevin; Mouras, Rabah; Liu, Ning; Mani, Aladin; Peremans, André; Tofail, Syed A.M.; Silien, Christophe
The spatial resolution in far-field mid-infrared (λ>2.5 μm) microscopy and microspectroscopy remains limited with the full-width at half maximum of the point-spread function ca. λ/1.3; a value that is very poor in comparison to that commonly accessible with visible and near-infrared optics. Hereafter, it is demonstrated however that polymer beads that are centre-to-centre spaced by λ/2.6 can be resolved in the mid-infrared. The more than 2-fold improvement in resolution in the far-field is achieved by exploiting a newly constructed scanning microscope built around a mid-infrared optical parametric oscillator and a central solid-immersion lens, and by enforcing the linear polarization unidirectional resolution enhancement with a novel and robust specimen error minimization based on a particle swarm optimization. The method is demonstrated with specimens immersed in air and in water, and its robustness shown by the analysis of dense and complex self-assembled bead islands.
Keyword(s): instrumentation; measurement; metrology
Publication Date:
Type: Journal article
Peer-Reviewed: Yes
Language(s): English
Institution: University of Limerick
Funder(s): Science Foundation Ireland
Citation(s): 280804
Optics Express;24 (21), pp. 24377-24389
FP7 280804 2012-2015
Publisher(s): Optical Society of America
First Indexed: 2017-11-24 06:25:13 Last Updated: 2018-09-15 06:25:07