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We have measured the transverse voltage from slant‐angle‐deposited metal films due to laser illumination as a function of film geometry. For a fixed laser spot size, the voltage is found to vary inversely with film width d for d small compared to contact separation a. For d/a ⩾∼1 the voltage approaches a constant. The experimental results are in good agreement with the open‐circuit voltage from a finite‐current dipole and consistent with the thermoelectric model previously proposed. Useful design parameters for transverse thermoelectric optical detectors are implied by the data.