Broadband　antireflection　(AR)　is　highly　significant　in　a　wide　range　of　optical　applications,　and　using　a　gold　(Au)　micropattern　presents　a　viable　method　for　controlling　the　behavior　of　light　propagation.　This　study　investigates　a　novel,　to　the　best　of　our　knowledge,　methodology　to　achieve　broadband　AR　properties　in　Au　micropatterns.　It　employed　the　three-dimensional　finite-difference　time-domain　(FDTD)　method　to　simulate　and　optimize　the　design　of　micropatterns.　In　contrast,　the　fabrication　of　Au　micropatterns　was　carried　out　using　two-beam　laser　interference　lithography　(LIL).　The　fabricated　Au　micropatterns　were　characterized　by　a　scanning　electron　microscope　(SEM)　and　spectroscope　to　validate　their　antireflection　and　transmission　properties　and　evaluate　their　performance　at　various　wavelengths.　The　optimized　Au　micropatterns　had　a　high　transmittance　rating　of　96.2%.　In　addition,　the　device　exhibits　a　broad-spectrum　antireflective　property,　covering　wavelengths　ranging　from　400　to　1100　nm.　The　simulation　data　and　experimentally　derived　results　show　comparable　patterns.　These　structures　can　potentially　be　employed　in　many　optical　devices,　such　as　solar　cells　and　photodetectors,　whereby　achieving　optimal　device　performance　reduced　reflection　and　enhanced　light　absorption.　©　2024　Optica　Publishing　Group.