Supplementary materials for the study "Spin angular momentum–encoded single-photon emitters in a chiral nanoparticle–coupled WSe₂ monolayer" include figures and tables. Figure S1 shows a 2D silica-coated chiral nanoparticle (cNP) used for theoretical analysis, with structural parameters determined by SEM imaging. Figure S2 describes the optical measurement setup, including a laser, objective lens, and polarization optics for Stokes parameter measurements. Figure S3 details the fabrication of a large-scale 2D array of cNPs, including insertion into PDMS nanowells, transfer to a SiO₂ substrate, and deposition of a WSe₂ monolayer. Figure S4 presents single-photon characteristics, including photon-correlation measurements for additional emitters and second-order time correlation functions. Figure S5 shows numerical calculations for an achiral metal nanocube, including magnetic field distributions and Stokes parameters as functions of dipole orientation. Figure S6 illustrates a single-photon emitter on an Au substrate, showing enhanced photoluminescence and photon correlation functions. Tables S1 and S2 provide peak wavelengths and Stokes parameters for single-photon emitters coupled with cNPs and Au nanocubes, respectively. The Stokes parameters correspond to degree of circular polarization (DOCP) and degree of linear polarization (DOLP). The supplementary materials support the study's findings on spin angular momentum–encoded single-photon emitters in a chiral nanoparticle–coupled WSe₂ monolayer.Supplementary materials for the study "Spin angular momentum–encoded single-photon emitters in a chiral nanoparticle–coupled WSe₂ monolayer" include figures and tables. Figure S1 shows a 2D silica-coated chiral nanoparticle (cNP) used for theoretical analysis, with structural parameters determined by SEM imaging. Figure S2 describes the optical measurement setup, including a laser, objective lens, and polarization optics for Stokes parameter measurements. Figure S3 details the fabrication of a large-scale 2D array of cNPs, including insertion into PDMS nanowells, transfer to a SiO₂ substrate, and deposition of a WSe₂ monolayer. Figure S4 presents single-photon characteristics, including photon-correlation measurements for additional emitters and second-order time correlation functions. Figure S5 shows numerical calculations for an achiral metal nanocube, including magnetic field distributions and Stokes parameters as functions of dipole orientation. Figure S6 illustrates a single-photon emitter on an Au substrate, showing enhanced photoluminescence and photon correlation functions. Tables S1 and S2 provide peak wavelengths and Stokes parameters for single-photon emitters coupled with cNPs and Au nanocubes, respectively. The Stokes parameters correspond to degree of circular polarization (DOCP) and degree of linear polarization (DOLP). The supplementary materials support the study's findings on spin angular momentum–encoded single-photon emitters in a chiral nanoparticle–coupled WSe₂ monolayer.