US 11,726,262 B2
In-plane chip-scale photonic device
Marcus Albrechtsen, Kgs. Lyngby (DK); Babak Vosoughi Lahijani, Kgs. Lyngby (DK); Søren Stobbe, Kgs. Lyngby (DK); and Rasmus Ellebæk Christiansen, Kgs. Lyngby (DK)
Assigned to DANMARKS TEKNISKE UNIVERSITET, Kgs. Lyngby (DK)
Filed by Danmarks Tekniske Universitet, Kongens Lyngby (DK)
Filed on May 18, 2022, as Appl. No. 17/747,290.
Application 17/747,290 is a continuation of application No. PCT/EP2020/082545, filed on Nov. 18, 2020.
Claims priority of application No. 19209876 (EP), filed on Nov. 18, 2019.
Prior Publication US 2022/0283372 A1, Sep. 8, 2022
Int. Cl. G02B 6/12 (2006.01); G02B 6/26 (2006.01); G02B 6/42 (2006.01); G02B 6/14 (2006.01)
CPC G02B 6/14 (2013.01) 20 Claims
OG exemplary drawing
 
1. An in-plane photonic device for use in a photonic integrated circuit with in-plane crossings of electrical connections and photonic waveguides, comprising:
at least one input optical waveguide; and
at least one output optical waveguide;
wherein the at least one input optical waveguide and the at least one output optical waveguides are positioned such that a gap between them separates the input and the output optical waveguide(s), and
wherein at least one of the input optical waveguides and/or at least one of the output optical waveguides comprise at least one subwavelength lensing feature, such that the input and the output optical waveguides are configured for optical mode matching across the gap, such that an optical signal can be transmitted from the input optical waveguide to the output optical waveguide across the gap with a transmission of at least 90% and with a reflection of less than 10%, such that the in-plane photonic device forms an in-plane electro-photonic circuit crossing,
wherein the at least one subwavelength lensing feature comprises a material with a different index of refraction than surrounding material of the corresponding waveguide, and/or the subwavelength lensing feature comprises forming at least a part of the input waveguide and/or the output waveguide by means of concave and/or convex structures.