A novel optical characterization technique called localized surface plasmon resonance (LSPR) spectroscopy is presented. LSPR spectroscopy exploits light excited surface plasmons, which are collective coherent electron oscillations at a metal/dielectric interface. The LSPR can be observed in a transmission spectrum and it is very sensitive to the constituent materials as well as both lateral and vertical dimensions of the structures. This makes LSPR spectroscopy interesting for a number of applications including nanometrology. Like scatterometry, LSPR spectroscopy requires test structures and computer simulations to establish the correlation between spectra and physical dimensions. Instead of measuring on individual structures like CD-SEM and AFM, LSPR spectroscopy measures on an array of test structures with an arbitrary array size. This makes LSPR spectroscopy particularly interesting for dense device layers where the vacant space for test structures is limited.In this work, LSPR spectroscopy is used to evaluate a fabrication process including imprinting, etching and metallisation of gammadion test structures distributed on a 4” wafer.
Proceedings of Cleo Europe 2013, 2013
etching; metallisation; optical testing; spectroscopy; surface plasmon resonance; Aerospace; Bioengineering; Communication, Networking and Broadcast Technologies; Components, Circuits, Devices and Systems; Engineered Materials, Dielectrics and Plasmas; Engineering Profession; Fields, Waves and Electromagnetics; General Topics for Engineers; Nuclear Engineering; Photonics and Electrooptics; Power, Energy and Industry Applications; collective coherent electron oscillations; Correlation; dense device layers; Educational institutions; fabrication process; gammadion test structures; imprinting; light excited surface plasmons; localized surface plasmon resonance spectroscopy; LSPR spectroscopy; metal-dielectric interface; nanometrology; Nanotechnology; optical characterization technique; Plasmons; scatterometry; Size measurement; Spectroscopy; transmission spectrum; Uncertainty
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Conference on Lasers and Electro-Optics Europe 2013 (CLEO Europe)