Patent ID: 7300730

Claim:
A method of using an optically tunable anti-reflective coating (OTARC) layer comprising: providing a substrate having a material layer thereon; depositing an optically tunable anti-reflective coating (OTARC) layer on the material layer, wherein the OTARC layer comprises a first set of optical properties optimized, tuned and/or enhanced for an exposure process and a second set of optical properties optimized, tuned and/or enhanced for a measurement process, the OTARC layer comprising a polymer, an acid generator compound, and a metrology enhancing material being coupled to the polymer using or as a leaving group wherein the second set of optical properties is established after the leaving group is removed; depositing a photoresist layer on the OTARC layer; exposing the photoresist layer to radiation using a reticle and a radiation source, wherein removable regions and un-removable regions are established in the photoresist layer, wherein a solubility change occurs in the removable regions of the photoresist layer; developing the exposed photoresist layer, wherein the removable regions are removed and the un-removable regions are used to create a plurality of structures in the photoresist layer; and establishing the second set of optical properties in the OTARC layer, wherein the leaving group is removed during the developing process and reflectivity data for the OTARC layer is changed.