Ir reflective multilayer optical films

An optical film comprising:

• a structured infrared reflector having a thickness direction and shaped into a plurality of at least two alternating first and second segments extending along a length and arranged along a width of the optical film, each pair of adjacent first and second segments defining an inclusion angle of between about 50 degrees and about 110 degrees therebetween;
• and
• substantially planarizing first and second films disposed on opposite major first and second sides of the structured infrared reflector and substantially conforming to and substantially planarizing the at least two alternating first and second segments along the length and the width of the optical film,
• wherein each of the first and second sides of the structured infrared reflector has an average peak‑to‑valley nonlinearity due to the alternating first and second segments, and each of the planarizing first and second films reduces the average peak‑to‑valley nonlinearity of the corresponding side of the optical film by at least a factor of 2;
• wherein, for a substantially normally incident light, for at least one polarization state, and for a visible wavelength range extending from about 420 nm to about 680 nm and an infrared wavelength range extending from about 750 nm to about 1200 nm, the optical film has an average optical transmittance greater than about 70% in the visible wavelength range and reflects greater than about 60% of the incident light in a direction that makes a first angle of greater than about 20 degrees with the incident light for at least one wavelength in the infrared wavelength range.