Time-resolved photocurrents in quantum well/dot infrared photodetectors with different optical coupling structures
2012 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 100, no 4, 043502- p.Article in journal (Refereed) Published
Temporal developments of photocurrents excited by an infrared radiation pulse in quantum well/dot infrared photodetectors with different optical coupling structures have been theoretically studied. It is shown that the light diffraction in a conventional reflective grating structure is a near-field effect containing severe crosstalk from neighboring pixels. A concave reflector not only eliminates the crosstalk but also strongly diffracts and focuses the incident electric field into deep active layers, which significantly increases the photocurrents in the photodetectors.
Place, publisher, year, edition, pages
2012. Vol. 100, no 4, 043502- p.
IdentifiersURN: urn:nbn:se:kth:diva-91623DOI: 10.1063/1.3678637ISI: 000300064500067ScopusID: 2-s2.0-84863018238OAI: oai:DiVA.org:kth-91623DiVA: diva2:511862
QC 201203232012-03-232012-03-192012-05-07Bibliographically approved