Recording head with an on-wafer integrated laser

• US 9,607,638 B1
• Filed: 11/19/2015
• Issued: 03/28/2017
• Est. Priority Date: 11/19/2014
• Status: Active Grant

• Current Assignee: Seagate Technology LLC (Seagate Technology Holdings Plc)
• Original Assignee: Seagate Technology LLC (Seagate Technology Holdings Plc)
• Inventors: Hardy, Michael J., Olson, Scott Eugene, Tatah, Karim, Wu, Yi-Kuei Ryan, Gubbins, Mark, Mooney, Marcus B.
• Primary Examiner(s): Hindi, Nabil
• Application Number:
  US14/946,294
• Time in Patent Office: 495 Days
• Field of Search: 360/59, 360/313, 369/13.33, 369/13.13, 369/112.23, 369/112.27, 369/120, 369/121
• US Class Current: 1/1
• CPC Class Codes: G11B 2005/0021 Thermally assisted recording using an auxiliary energy source for heating the recording layer locally to assist the magnetization reversal
• CPC Class Codes: G11B 5/105 Mounting of head within housing or assembling of head and housing G11B5/3103 takes precedence
• CPC Class Codes: G11B 5/314 where the layers are extra layers normally not provided in the transducing structure, e.g. optical layers G11B5/3196 takes precedence
• CPC Class Codes: G11B 5/3163 Fabrication methods or processes specially adapted for a particular head structure, e.g. using base layers for electroplating, using functional layers for masking, using energy or particle beams for shaping the structure or modifying the properties of the basic layers
• CPC Class Codes: G11B 5/6088 Optical waveguide in or on flying head

Abstract

A recording head includes a layer of plasmonic metal deposited on a surface of the recording head. One or more non-self-supporting layers of crystalline material are attached to the plasmonic metal, the one or more layers of crystalline materials configured to form an active region of a laser. A waveguide is configured to receive plasmons from the laser and direct the plasmons to a recording medium.

Claims

1. A recording head comprising:

a layer of plasmonic metal deposited on a surface of the recording head, the layer of plasmonic metal comprising two plate-like elements with a gap in between;

one or more non-self-supporting layers of crystalline material attached to the plasmonic metal within the gap, the one or more layers of crystalline materials configured to form an active region of a laser; and

a waveguide configured to receive plasmons from the laser and direct the plasmons to a recording medium.

2. The recording head of claim 1, wherein the one or more layers of crystalline material are transfer printed to the recording head.

5. The recording head of claim 1, wherein the waveguide shapes the plasmons to create a sub-50 nm spot on the recording medium.

3. A recording head comprising:

a layer of plasmonic metal deposited on a surface of the recording head;

one or more non-self-supporting layers of crystalline material attached to the plasmonic metal, the one or more layers of crystalline materials configured to form an active region of a laser;

a second layer of the plasmonic metal attached to the one or more layers of crystalline material opposite the layer of the plasmonic metal; and

a waveguide configured to receive plasmons from the laser and direct the plasmons to a recording medium.

4. The recording head of claim 3, wherein at least one of the first and second layers of the plasmonic metal is shaped as a circular disk with a peg protruding therefrom.

19. The recording head of claim 3, further comprising a distributed Bragg reflector mirror formed on at least one end of the one or more layers of crystalline material.

6. A recording head comprising:

a layer of plasmonic metal deposited on a surface of the recording head;

one or more non-self-supporting layers of crystalline material attached to the plasmonic metal, the one or more layers of crystalline materials comprising two thin III-V semiconductor layers surrounding a III-V cavity and configured to form an active region of a laser, wherein the plasmonic metal surrounds the one or more layers of crystalline material on at least three adjacent sides; and

a waveguide configured to receive plasmons from the laser and direct the plasmons to a recording medium.

7. The recording head of claim 6, wherein the waveguide comprises a plasmonic waveguide.

20. The recording head of claim 6, further comprising a distributed Bragg reflector mirror formed on at least one end of the one or more layers of crystalline material.

8. A recording head comprising:

a layer of plasmonic metal deposited on a surface of the recording head;

one or more non-self-supporting layers of crystalline material attached to the plasmonic metal, the one or more layers of crystalline materials configured to form an active region of a laser;

a waveguide configured to receive plasmons from the laser and direct the plasmons to a recording medium; and

a distributed Bragg reflector (DBR) mirror formed on at least one end of the one or more layers of crystalline material.

9. The recording head of claim 8, wherein the DBR comprises a mode shaping mirror.

10. A recording head, comprising:

a waveguide comprising an exposed surface;

a non-self-supporting, laser subassembly attached to the exposed surface, the laser subassembly comprising one or more crystalline layers such that light is emitted from the one or more crystalline layers through the exposed surface;

first and second mirrors formed on respective first and second ends of the laser subassembly; and

electrical leads formed on and coupled to the laser subassembly.

11. The recoding head of claim 10, wherein the laser subassembly further comprises a grating, the light being emitted from the crystalline layers via the grating.

12. The recording head of claim 11, wherein the laser subassembly comprises two or more contacts on an outer surface facing away from the grating, the electrical leads formed on the two or more contacts.

13. The recording head of claim 10, wherein one of the first and second mirrors comprises a first angled mirror, the light being emitted through the exposed surface of the waveguide via the angled mirror, the waveguide further comprising a second angled mirror that receives the light emitted through the exposed surface.

14. The recording head of claim 13, wherein the light propagates in a direction with which both the crystalline layers and the waveguide are longitudinally aligned.

15. The recording head of claim 13, wherein the light propagates in a first direction with which the crystalline layers are longitudinally aligned, and, after reflection by the first and second mirrors, along a second direction with which the waveguide is longitudinally aligned.

17. The recording head of claim 12, wherein the stripes are formed from a single piece of crystalline laser material that is processed after attachment to form the stripes.

18. The recording head of claim 12, wherein the higher-order mode comprises a TE10 antisymmetric mode.

16. A recording head comprising:

a slider waveguide formed on a substrate;

a non-self-supporting, laser subassembly bonded to the slider waveguide, the non-self-supporting laser subassembly comprising at least two stripes, the at least two stripes exciting a higher-order mode laser output; and

a coupling waveguide configured to couple the higher-order mode laser output to a delivery waveguide, the delivery waveguide delivering the laser output to a recording medium.