  In-plane Hyperbolic Phonon polaritons (HPhPs) are quasiparticles formed via
coupling of photons and optical phonons in in-plane hyperbolic materials and
offer unique applications in sensing, thermal emitters and high resolution
imaging. However, the large momentum mismatch between photons and these
in-plane HPhPs has restricted their technological potential as most
experimental demonstration rely on sophisticated and expensive near field
detection schemes. In this work, using the example of $\alpha-$MoO$_3$, we
demonstrate that by constructing photonic hypercrystals of this material, one
can not only excite these in-plane HPhPs in the far field but also tune the far
field response via twisting the hypercrystal lattice with respect the lattice
of $\alpha-$MoO$_3$. Our findings will pave the way for the development of
practical in-plane HPhP devices as well as provide access to new fundamental
physics of such materials via conventional and well developed far field
measurement techniques.
