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An aluminium-gold configuration for electric field enhancement based on surface plasmon resonance phenomenon is proposed. Our results and study show that for optimized bimetallic configuration (6 nm Au and 29 nm Al) along with chalcogenide prism, the electric field enhancement at the metal-analyte interface is more than 15 times greater and its probing depth is more than 300% longer than that of the gold based BK7 configuration thereby opening a new window for monitoring the biomolecular interactions in the vicinity of metal-analyte interface for various applications.