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We present deep polarimetric observations of the European Large Area ISOSurvey-North 1 (ELAIS-N1) field using the Low Frequency Array (LOFAR) at114.9-177.4 MHz. The ELAIS-N1 field is part of the LOFAR Two-metre Sky Surveydeep fields data release I. For six eight-hour observing epochs, we align thepolarization angles and stack the 20"-resolution Stokes $Q$, $U$-parameter datacubes. This produces a 16 deg$^2$ image with 1$\sigma_{\rm QU}$ sensitivity of26 $\mu$Jy/beam in the central area. In this paper, we demonstrate thefeasibility of the stacking technique, and we generate a catalog of polarizedsources in ELAIS-N1 and their associated Faraday rotation measures (RMs). Whilein a single-epoch observation we detect three polarized sources, this numberincreases by a factor of about three when we consider the stacked data, with atotal of ten sources. This yields a surface density of polarized sources of oneper 1.6 deg$^2$. The Stokes $I$ images of three of the ten detected polarizedsources have morphologies resembling those of FR I radio galaxies. Thisrepresents a greater fraction of this type of source than previously found,which suggests that more sensitive observations may help with their detection.

LOFAR Deep Fields: Probing a broader population of polarized radio galaxies in ELAIS-N1