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We report a very high precision interferometric sensor with resolution up to~{\lambda}/1024, exploiting hollow photonic bandgap waveguide-based geometryfor the first time. Here sensing has been measured by a complete switching inthe direction of the outgoing beam, owing to transverse momentum oscillationphenomena. Using a 1.32 {\mu}m source and core-width of 7.25 {\mu}m, a completeswitching cycle is obtained even due to a small change of ~1 nm in thecore-width. Using hollow-core photonic bandgap waveguide, Talbot effect,revivals of the initial phase, oscillation in the transverse momentum alongwith multi-mode interference served as the backbone of the design. Theultra-sensitive multi-mode interferometric sensor based on photonic crystalswill certainly open up a paradigm shift in interferometer-based sensingtechnologies toward device-level applications in photonic sensing/switching andrelated precision measurement systems.

Photonic Crystal Based Ultra-Sensitive Interferometric Sensor with Spatial Resolution up to 1 nm