Half-wave　plates　were　introduced　into　an　interference-lithography　scheme　consisting　of　three　fibers　that　were　arranged　into　a　rectangular　triangle.　Such　a　flexible　and　compact　geometry　allows　convenient　tuning　of　the　polarizations　of　both　the　UV　laser　source　and　each　branch　arm.　This　not　only　enables　optimization　of　the　contrast　of　the　produced　photonic　structures　with　expected　square　lattices,　but　also　multiplies　the　nano-patterning　functions　of　a　fixed　design　of　fiber-based　interference　lithography.　The　patterns　of　the　photonic　structures　can　be　thus　tuned　simply　by　rotating　a　half-wave　plate.　(C)　2015　Optical　Society　of　America