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This letter demonstrates the design and experimental verification of a very low-power consuming, polarization-independent, and high-speed polymer Mach-Zehnder 2 ?? 2 photonic switch. This thermooptic switch operated with less than 4 mW of power consumption via a small-area heater. This device is, to the author's best knowledge, the most efficient and practical polymer photonic switch operating with polarization independence and low crosstalk of less than -25 dB.