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Sensitivity and scattering in a monolithic heterodyned laser biochemical sensor

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6 Author(s)
Cohen, D.A. ; Dept. of Electr. & Comput. Eng., Univ. of California, Santa Barbara, CA, USA ; Nolde, J.A. ; Pedretti, A.T. ; Wang, C.S.
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We discuss the sensitivity of a novel biochemical sensor based on the heterodyne detection of the optical frequency shift between two monolithically integrated frequency-tunable lasers. A hundred-fold improvement may be obtained by replacing the traditional ridge waveguide structure with a quasisymmetrically clad channel waveguide, which we demonstrate in a simple coupled-cavity sensor. In most cases, the optical scattering from biomolecules bound to such a waveguide will be negligible.

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Selected Topics in Quantum Electronics, IEEE Journal of  (Volume:9 ,  Issue: 5 )