Magnitude and direction distributions of the transverse force for 532 nm: (a) m = 2, n = 3; (b) m = 2, n = 4; (c) m = 2, n = 5; (d) m = 3, n = 4; (e) m = 3, n = 5; (f) m = 3, n = 6. The red circled regions mark the trapping positions. m and n are the orders of the beams used.