Standard beam splitters, including cube and plate types, are generally bidirectional, meaning they can split or combine light regardless of which side the light enters. For example, a cube beam splitter will transmit part of the light and reflect the rest whether the beam comes from the left, right, top, or bottom, following the same reflection/transmission principles as a mirror with partial transmission (Physics Stack Exchange) and Wikipedia . Plate beam splitters also function similarly, though they may have a preferred orientation to minimize unwanted reflections or protect coatings (Edmund Optics), . Non-polarizing beam splitters are designed to handle unpolarized light in either direction, while polarizing beam splitters separate light based on polarization but still operate bidirectionally under normal conditions (Thorlabs), .
Although conventional beam splitters are bidirectional, practical usage often recommends a preferred direction. For instance, cube beam splitters are typically oriented so that light enters the coated prism first to avoid damaging the adhesive or coating, which can affect performance (Edmund Optics), . This does not make them unidirectional in principle, but it optimizes efficiency and longevity.
Some advanced designs, particularly certain polarization beam splitters using non-Hermitian PT-symmetry, can be unidirectional. These devices allow one polarization of light to be fully reflected from one side while being transparent from the opposite side, creating asymmetric behavior that is not possible with conventional bidirectional splitters (arXiv), . Such unidirectional splitters are used in applications requiring precise polarization control or optical isolation.
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