“…The recent advances of releasable and transfer printable Si nanomembranes (NMs) [44][45][46][47][48][49][50][51][52][53], still inheriting the single crystal quality of bulk Si, have enabled Si to be applicable to optical devices built on the foreign substrate by printing method [54][55][56][57][58][59]. While there're many photonic crystals made with polymers, amorphous materials, and metals [60][61][62][63][64][65], Si NMs have very high index but the absorption loss is almost negligible, therefore, with Si NMs, a unique and high performance 2D PCS can be realized. In this review, we introduce 2D Si NM PC mirrors built on the glass substrate by transfer printing method as an example [66].…”