“…Smart materials belong to a group of matters. Such physical properties can be changed upon external stimulus i.e., electric [1,2,3,4] or magnetic field [5,6,7,8], pH [9,10,11,12], temperature [13,14,15,16], or light [17,18,19,20]. The systems exhibiting reversible photo-actuation and light-responsive properties are vital for the research community only during the last decade while the rest of the above mentioned properties have been part of the research community over the past 30 years.…”