Micron scale directional coupler as a transducer for biochemical sensing | Zendy

Ken Uchiyamada | Zendy; Kyohei Okubo | Zendy; Mitsuo Yokokawa | Zendy; Edwin T. Carlen | Zendy; K. Asakawa | Zendy; Hiroaki Suzuki | Zendy

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Micron scale directional coupler as a transducer for biochemical sensing

Author(s) -

Ken Uchiyamada,

Kyohei Okubo,

Mitsuo Yokokawa,

Edwin T. Carlen,

K. Asakawa,

Hiroaki Suzuki

Publication year - 2015

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.23.017156

Subject(s) - cladding (metalworking) , optics , transducer , refractive index , materials science , signal (programming language) , power dividers and directional couplers , optoelectronics , light intensity , physics , acoustics , computer science , metallurgy , programming language

A microfabricated directional coupler (DC) was used for the detection of DNA conjugated with quantum dots. Output optical signals from DCs of a wide range of device lengths correspond well to theoretical and simulation results. Even 20 µm-long DC devices could detect changes in the output optical intensity by monitoring the near-field pattern using a CCD camera. The signal was enhanced 60 × using a 1500 µm-long DC device. For large cladding refractive-index changes between air and water, the normalized signal changed cyclically several times between 0 and 1. The results suggest that the DC can be the basis for miniaturized two-dimensionally integrated biochemical sensors.

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